Definition of bolt-on in English:



  • 1(of an extra part of a machine) able to be fastened on with a bolt or catch.

    ‘a bolt-on accessory available for most 35 mm SLRs’
    • ‘Valeo describes it as a bolt-on unit that uses existing alternator engine mountings.’
    • ‘The new car also has bolt-on end structures to reduce both the time and cost of crash repair.’
    • ‘More rumor on the dusty street pointed to a new integrated disc brake mount (no more heavy bolt-on unit).’
    • ‘Bolt-on armour plates provide protection against 7.62 mm armour piercing rounds and 152 mm artillery shell fragments from a range of more than 10m.’
    • ‘Well it seems like the boy racers spend a huge fistful of money on cool neon lights, mag wheels and bolt-on performance products - but do they get down and dirty?’
    • ‘The bumper itself is re-shaped and finished in dark grey to match the bolt-on, over-size wheel flares that cover the new five-spoke 16-inch alloy wheels.’
    • ‘A bolt-on front end structure minimizes low-speed crash damage, and - along with the split rear fender - helps keep insurance costs in check.’
    • ‘I estimate the car to be a 1956 model and an American export car complete with bolt-on wheels.’
    • ‘Its intelligent bolt-on (IBO) chassis was developed with UK design house Eldon for analogue TVs, but it can be used to add digital capability.’
    • ‘The upscale LX trim level adds color-keyed bodyside molding, bolt-on wheel covers, a passenger-side vanity mirror, a cargo cover for the wagon, and upgraded upholstery.’
    • ‘The bolt-on stereo speakers are surprisingly good.’
    1. 1.1 Denoting a feature, service, etc. that has been or can be added to an existing arrangement.
      ‘there's no obligation to buy any type of bolt-on insurance product with a personal loan’
      • ‘We had to spend $50 million a year on servers, networking equipment, EDI, XML, and bolt-on applications to develop programs uniquely designed for certain industries.’
      • ‘Any download data consumed in excess of the bolt-on allowance will be charged at £3 per MB.’
      • ‘The software is provided to fulfil a specific independent trading function for financial market firms or as a bolt-on component to third-party software.’
      • ‘There has been growing recognition that security must be embedded into the fabric of applications during development, rather than as an afterthought left to security bolt-on features or third-party tools.’
      • ‘Such bolt-on deals are aimed at filling holes in a company's core businesses.’
      • ‘The last six years have shown conclusively that the strategy of remaining independent and supplementing organic growth with smaller bolt-on acquisitions has failed.’
      • ‘Animation courses in universities and art schools were traditionally bolt-on elements to illustration degrees and usually very specialised in nature.’
      • ‘Dental care and travel insurance might only be available as bolt-on extras rather than automatically included, even for fully comprehensive deals.’
      • ‘Sport is not a bolt-on extra in the lives of champions, sport is everything to them and victory the aim of their every waking moment.’
      • ‘A flagging enterprise may survive and prosper as a bolt-on acquisition or benefit from the economies of scale in a larger grouping.’
      • ‘Extracurricular activities tend to be a very important and integral part of what they have to offer, rather than a bolt-on extra.’
      • ‘Industry specialists also advise clients to be sceptical about expensive and unnecessary products which lenders and brokers may try to sell you as bolt-on products to the basic mortgage loan.’
      • ‘The team also produces bespoke bolt-on software for designers.’
      • ‘There will an optional bolt-on digital audio specification, allowing the standard to be used in multimedia kit.’


  • 1A bolt-on part of a machine.

    ‘the bike's bolt-ons were worth more than the asking price’
    • ‘Included with the sale is the car's original owner's manual and some detailed component manuals for the aftermarket bolt-ons.’
    • ‘In case prestigious BMW bloodlines simply aren't enough to impress, this Bavarian drop-top also features a long list of bolt-ons which transform it from a superb curve carver into a first rate speed machine.’
    • ‘Built off a 1967 Pontiac GTO Convertible, it featured genuinely interesting bodywork and some wild engine bolt-ons.’
    • ‘This Beetle's body features a ton of new trim and factory-fresh bolt-ons.’
    1. 1.1 A bolt-on feature, service, etc.
      ‘some network operators offer bolt-ons to help cut the cost of data usage abroad’
      • ‘If you want new features, generally you have to wait for them to implement them (okay, there are some plug-ins and bolt-ons).’
      • ‘Public health should, I believe, be at the core of the work of all healthcare professionals it should not be seen simply as a bolt-on.’
      • ‘He will probably not treat aesthetics as a bolt-on, recognising that it's a must-have in the current market.’
      • ‘At the client level XP is Win2k with bolt-ons, many of them naggy pop-ups.’
      • ‘People are finding lots of ways of making this an integral part of the curriculum, not seeing it as a bolt-on.’
      • ‘Another way to ensure that security measures are adopted across the organization is to make sure that the technology is more than just a bolt-on, that it is tightly integrated with existing desktop systems.’
      • ‘The market barely reacted to the announcement of the two bolt-ons, with the share price taking a slight dip by the end of the week.’
      • ‘More students are taking language courses, particularly in newly popular subjects such as Spanish - but it is now often a subsidiary bolt-on to another degree subject.’
      • ‘To access the technology runners will need to have handset with a GPS network, which is already fitted on many new mobiles or can be purchased as a bolt-on for as little as £40.’
      • ‘The plot is pretty much a bolt-on, of course, and you won't get up from this book and change the world, but it's certainly a nice bit of summer reading.’