Definition of exhaust in English:



[with object]
  • 1Make (someone) feel very tired.

    ‘her day out had exhausted her’
    • ‘I thrash around until I'm physically exhausted and finally fall asleep at about three in the morning.’
    • ‘Rolandon prepared to retort, but his muscles and arms were aching madly and he was exhausted, physically and mentally.’
    • ‘This kind of effort requires such an outpouring of unconditional love that it is exhausting and totally draining.’
    • ‘Many CFS sufferers can barely get out of bed and become exhausted after limited physical activity.’
    • ‘It was only midday, and he was already exhausted both physically and mentally.’
    • ‘As tired as he was, and indeed he was exhausted, he took questions for some time.’
    • ‘This audio equivalent of 1000 watts of bright white light shining directly in my eyes, I was physically exhausted from the end of the set.’
    • ‘Emily didn't move, she was physically exhausted; she couldn't even moan in her sleep at being disturbed.’
    • ‘It's physically and mentally exhausting, it's thankless, it's long days and late hours and you really have to be on the brink of insanity to enjoy it.’
    • ‘She collapsed against his chest, exhausted with the mental anguish of arguing with this man.’
    • ‘The war ended soon, our arms tired and our heads exhausted.’
    • ‘Children with anemia would have difficulties in concentrating, became easily exhausted and experienced general physical weakness.’
    • ‘Physically he was exhausted, but he knew even now, before the sun had even finished setting, that he would not sleep this night.’
    • ‘While Henry finds the character easy to understand on an emotional level, she admits she's been finding the play exhausting on a physical level.’
    • ‘But she was exhausted mentally and physically, and was happy to just lie down on the old bed.’
    • ‘Physically exhausted, emotionally drained and severely dehydrated, Ashby started to hallucinate.’
    • ‘Fans should try and understand that at a competition, when you finally get off the ice, you're exhausted and drained.’
    • ‘At the moment I am lying here absolutely exhausted from the whole mental and physical process of childbirth - I mean the afterbirth was a bit like having another baby.’
    • ‘It's tiring and exhausting to constantly have to boost an ego due to whatever reason.’
    • ‘You didn't have time for the things you really wanted to do, and you were so exhausted from the emotional drain of the season, you let your romance wilt.’
    tire out, wear out, overtire, overtax, fatigue, weary, tire, drain, run someone into the ground, run someone ragged, enervate, sap, debilitate, prostrate, enfeeble
    tiring, wearying, taxing, fatiguing, wearing, enervating, draining, sapping, debilitating
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  • 2Use up (resources or reserves) completely.

    ‘the country has exhausted its treasury reserves’
    • ‘Teams which finish third in the SPL tend to exhaust their resources in the process and Livingston will have to demonstrate that they are the exception to the rule.’
    • ‘South Korea, a US ally, prefers that all other diplomatic options be exhausted before the council takes up the issue.’
    • ‘It reports that its food reserves were exhausted by earthquakes last January and February, and is appealing for international aid.’
    • ‘Only when these options are exhausted would you be entitled to terminate employment.’
    • ‘I might have exhausted its possibilities by now.’
    • ‘His wars and other undertakings exhausted the state's reserves and forced him to look for other sources of income.’
    • ‘When stars that are more than three times the mass of our Sun finally exhaust their reserves of nuclear fuel they have no means of opposing the inward pull of gravity.’
    • ‘Having exhausted their own resources, the Americans would now like BC's resources to help keep US mill workers employed.’
    • ‘If the player exhausting the stock was the original dealer, she finishes her turn and the game is over.’
    • ‘By 1952 an improved grade of ore was encountered, and the lode was mined until 1956, when ore reserves were exhausted.’
    • ‘When the stock is exhausted, the players continue to play with the cards in their hands.’
    • ‘Some of these payments are simply transfer payments, rather than consuming or exhausting real resources.’
    • ‘They adapt very well to an itinerant existence for a few weeks, setting up shop in various places, until they exhaust their stock of goods.’
    • ‘The hospital had exhausted its stock, and the parents had failed to find a suitable donor.’
    • ‘Carting the coconuts on his cycle from Mettupalayam, Ramesh says his entire stock is exhausted by 3 p.m.’
    • ‘I may have exhausted my store of worthwhile material.’
    • ‘They claim the school could be rebuilt on its own land - but Education Leeds says it has exhausted all other options and claims the proposed site is the only chance the school has of being rebuilt.’
    • ‘He proclaimed that the country had exhausted its resources for any sort of upheaval and his rule would focus on the consolidation of the post-Soviet regime.’
    • ‘Our interpretation of these results is that the chorusing generally continues until energy reserves are exhausted.’
    • ‘It is this Ministry which will have its already stretched resources exhausted by treating soldiers and/or civilians hurt and wounded in the process.’
    use up, run through, go through, consume, finish, deplete, expend, spend, dissipate, waste, squander, fritter away
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    1. 2.1 Expound on or explore (a subject or options) so fully that there is nothing further to be said or discovered.
      ‘she seemed to have exhausted all permissible topics of conversation’
      • ‘Yet it is clear that the subject is not exhausted, as the book under review attests.’
      • ‘It has occurred to me that I could write about this one for a very long time without exhausting the subject.’
      • ‘Neither book gives the full story on Celebration, but between them they pretty much exhaust a subject that is fairly easily exhausted.’
      • ‘This book is composed of columns spanning the better part of a decade, and Richard still has a long way to go before exhausting his chosen subject.’
      • ‘Pieces like Message, The Road Between Four Parts, Ecology, Sanctuary and many others exhaust the topics offered by the theme.’
      • ‘Nor have these three hours exhausted the rich subject.’
      • ‘That their essays do not fully exhaust the subject merely indicates the size of the challenge.’
      • ‘I'm sure that I have not exhausted the subject with these comments and there are doubtless other considerations worthy of mention.’
      • ‘But these discussions hardly exhaust the subject, however much they might have exhausted my readers.’
      • ‘The objects on display all combine to describe the epoch but do not claim to exhaust the subject.’
      say all there is to say about, leave nothing left to say about, do to death
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  • 3Expel (gas or steam) from or into a particular place.

    ‘you should never exhaust bathroom air into your attic’
    • ‘Radiant cooling in the floor slab helps lower the room temperature more before the air is exhausted into an atrium space.’
    • ‘Because this is an extraction fan to exhaust the hot air from inside the central core, I glued a large metal washer to the rotor hub to hide the green PCB inside.’
    • ‘Heated air is exhausted through two grills front & rear.’
    • ‘Substantially clean air is exhausted from the top of SU2.’
    • ‘A number of cooling fans mounted at one end of the cooler would draw air into the chamber through filters, blow it over the surface of the product and exhaust the air at the exit end.’
    • ‘But the red and blue funnels are practical: the blue ducts take in fresh air, and the red ones exhaust used air.’
    • ‘During and after installation, use window fans and room air conditioners to exhaust fumes to the outdoors.’
    • ‘All three fans are configured to exhaust the air through the top of the unit.’
    • ‘Time to look at the rear fans: they will exhaust the air out of the case.’
    • ‘Now while this sounds like a good thing, since you are pretty much going to be exhausting the hot air directly out the back of the case, it does leave little room to mount the second fan.’
    • ‘There are two 80 mm fan mounts, one of which has a provided fan already mounted to exhaust hot air from around the CPU and video card area inside the case.’
    • ‘Just above these connections is the grill plate used by the cooler to exhaust the warm air.’
    • ‘Cars were as old fashioned as buggies and hovering crafts that ran off of air and exhausted pure steam were used instead.’
    • ‘As outlined in the specifications, there is a 120 mm fan that is configured to exhaust air to the rear of the case and out.’
    • ‘At the rear of the case, near the area the CPU will likely be located, we have a 120 mm fan for exhausting the warm air from the case.’
    • ‘The fireplace in use exhausts household air until a negative pressure situation exists.’
    • ‘Most newer cryosurgical units are equipped with a scavenging port from which the gas is exhausted.’
    • ‘The fan is configured to exhaust air from the top, which in theory, should work pretty well.’
    • ‘Here the compound was at a disadvantage, fitted as it was with four sets of slide valves which did not exhaust the steam nearly as freely.’
    • ‘Heated air was exhausted through the car's rear bumper, via a thermostat-controlled flap.’


mass noun
  • 1Waste gases or air expelled from an engine, turbine, or other machine in the course of its operation.

    ‘buses spewing out black clouds of exhaust’
    as modifier ‘exhaust fumes’
    • ‘Particulate matter of diesel engine exhaust from four different fuels was studied for content of polynuclear aromatic compounds and mutagenic effects.’
    • ‘The researchers released a tracer gas into the engine exhaust and measured concentrations of that gas inside the buses.’
    • ‘As the aircraft gained altitude, the turbosupercharger would begin to function, taking exhaust gases from the engine to the turbine via the tubing.’
    • ‘Seconds later, the squad and two larger rigs were gone in a flurry of sirens, growling engines and diesel exhaust.’
    • ‘Duraisamy, a farmer who was unhappy that food went cold by the time his wife brought it from home, used the heat wasted through the exhaust of pump engine to reheat the food.’
    • ‘The engine is mounted on the top surface of the rear fuselage section with the engine exhaust between the V-shaped tail wings.’
    • ‘It doesn't even have the smell of engine exhaust.’
    • ‘The generator's owner, a frail old Korean man, was warming his hands in the buzzing machine's exhaust.’
    • ‘Nonetheless, the plane's surface will always be hotter than background levels, and exhaust gases cannot be entirely cooled.’
    • ‘Buses with gasoline and diesel engines produce tons of exhaust gas every day containing many poisonous elements including carbon monoxide and lead.’
    • ‘With the holes in the floor more or less closed up all the cold draft is replaced by warm engine air and exhaust.’
    • ‘Used against helicopters and low flying fixed-wing jets, it homes in on the heat given off by the target aircraft's engine exhaust.’
    • ‘Designed with smokeless exhaust diesel engines aided by gas turbines, air pollution is kept minimal.’
    • ‘They are designed to be triggered from a tube-like, disposable launcher and to follow the heat of a jet engine's exhaust to its source.’
    • ‘The efficiency of the engine has been improved, by a fundamental redesign of the way air and fuel are pulled into the combustion chamber, and the way that exhaust gases are ported out.’
    • ‘The bigger lungs on the intake side and the freer-flowing exhaust help the engine rev even faster.’
    • ‘He later learned that exhaust gases were leaking into the cabin of his car.’
    • ‘Despite extensive warnings and media coverage throughout the year, carbon monoxide in exhaust from boat engines found new ways to take lives this summer.’
    • ‘Temperatures were more than 50C - the combination of engine exhaust, direct sunlight and radiated heat from the tarmac.’
    • ‘The noise of the engines was deafening as they belched thick black clouds of diesel exhaust.’
    smoke, vapour, gas, exhalation, exhaust, effluvium, pollution
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    1. 1.1count noun The system through which exhaust gases are expelled.
      as modifier ‘an exhaust pipe’
      • ‘Under the cover of darkness, exotic sports cars come alive with red-hot glowing brakes, flaming exhausts and sparks from contact as drivers battle both the elements and other drivers.’
      • ‘Particle diameters < 300 nm dominate the mass distribution of both gasoline and diesel emissions, but the gasoline particle diameters are on average smaller than particles found in diesel exhausts.’
      • ‘Millions of tonnes are spewed out of vehicle exhausts and power station smokestacks every year, as well as being released from the soil when fields are ploughed.’
      • ‘It has twin exhausts, big wheels, a spoiler, frog-style foglights and a turbocharged 2 litre engine that kicks out 225 bhp.’
      • ‘So now you don't need customised exhausts, the stock system is plenty good enough as it should be in a car of this category.’
      • ‘In diesel exhaust they have very rich oxides of nitrogen, and what that does is it nitrates the PAHs, which makes them more toxic than the ones that have come out of motor vehicle exhausts.’
      • ‘Ford has flared the wheel arches, given it a handsome front grille, twin steel exhausts and a subtle boot spoiler.’
      • ‘Dual exhausts, with cutouts in the bumper to accommodate them on the V6, are more often found on performance cars.’
      • ‘About all you needed then were bigger engines with bigger carburetors and bigger exhausts.’
      • ‘Stay away from the direct exhausts, especially with diesel engines’
      • ‘Brakes, exhausts and suspension need to be replaced when they show signs of tiredness.’
      • ‘The scope of the certification includes design, development, production and installation of exhausts, engines, transmissions, electronics and safety equipment for the automotive industry.’
      • ‘The layout of the exhausts is fundamentally different to that of the previous car, eliminating the aerodynamic profile which characterised the rear section, which is now almost entirely integrated within the bodywork.’
      • ‘Lung cancer has become the most common cause of cancer deaths due to increased tobacco habit and environmental pollutants especially automobile exhausts.’
      • ‘They can regain power, and efficiency, by adding valves (three or four per cylinder) and camshafts: one per bank for intakes, another for exhausts.’
      • ‘There are two types of exhausts system: the Dual Exhaust System (also twin exhaust system) and the Emission Control System.’
      • ‘Though the cars themselves are nothing special, the 3m vertical exhausts pipes are surely worthy of documentation.’
      • ‘Like the first GTI from 1976, the new model has a distinctive black grille with red accent lines, bigger wheels and twin exhausts.’
      • ‘The categories will be extended next year to include faulty windscreen wipers and washers; damaged registration plates; noisy exhausts and transmission.’
      • ‘Most of the nitrogen oxide pollution in Australian and New Zealand cities comes from motor vehicle exhausts in summer and a combination of motor vehicle exhausts and home heating in winter.’


Mid 16th century (in the sense ‘draw off or out’): from Latin exhaust- ‘drained out’, from the verb exhaurire, from ex- ‘out’ + haurire ‘draw (water), drain’.