Definition of dead zone in English:

dead zone

noun

  • 1A place or period in which nothing happens or in which no life exists:

    ‘the week before Christmas is always a dead zone at work’
    • ‘The result is an oxygen-depleted dead zone at the bottom of the sea where few creatures can survive. A massive dead zone appears every summer in the Gulf of Mexico off the coast of Louisiana and Texas.’
    • ‘The increasing level of bioactive nitrogen is also being cited as a cause of dead zones in the ocean due to microbial overgrowth.’
    • ‘The main cause of dead zones is nitrogen, primarily from agricultural fertilizers that run off into rivers and streams and then into the ocean, where they cause massive algae blooms.’
    • ‘Today, oyster beds are one percent of their historic high and more than 40 percent of the waters are dead zones - too starved of oxygen to sustain aquatic life.’
    • ‘And fertilizers in the Mississippi have created dead zones where fish cannot live.’
    • ‘Irrigation, agricultural and urban run-off has caused dead zones in many rivers and lakes, and in some oceans.’
    • ‘However, some agricultural industry groups contend that there is not enough evidence to link farm runoff to red tides or dead zones.’
    • ‘So, basically, these dead zones, would be water with no extra oxygen (beyond the water molecule). Is that what you're saying?’
    • ‘The research also found that biodiversity loss is tightly linked to declining water quality, harmful algal blooms, ocean dead zones, fish kills, and coastal flooding.’
    • ‘‘We can see what's going on in North Carolina,’ where nutrient runoff from hog factory waste has created biological dead zones along the coast.’
    • ‘Go to the bottom of the oceans, not Mars, and set up operations to clean up the oceans and rebuild some of the manmade dead zones in the seas.’
    • ‘In the Mississippi River Basin, some of that nitrogen eventually ends up in the Gulf of Mexico, where it can create periodic dead zones.’
    • ‘The results of their studies could affect farming practices throughout the humid regions of the United States and may also help reduce the size of the so-called dead zone in the Gulf of Mexico.’
    • ‘That excessive fishing and pollution have created giant dead zones in the ocean.’
    • ‘For example, researchers in New Orleans designed a submersible sensor to monitor harmful algal species, such as those responsible for red tide and dead zones.’
    • ‘Devoid of dissolved oxygen, the dead zone owed its existence to massive flows of fertilizers collected by the Mississippi and its tributaries.’
    • ‘Pollution, particularly the overuse of nitrogen in fertilizers, is responsible for the spread of dead zones, environment ministers and experts from more than 100 countries were told.’
    • ‘As bacteria break down the diatoms in these dead zones, hydrogen sulfide gas is generated as a byproduct.’
    • ‘Removal of key predators and entire layers of the food chain set off sequences of events that are now culminating in toxic algal blooms, dead zones, outbreaks of diseases, and other symptoms of ecological instability.’
    • ‘The collapse of fishery after fishery, creating vast underwater dead zones, is vivid proof of that.’
    1. 1.1 An area of the ocean that is depleted of oxygen, frequently due to pollution.
      • ‘With demand for corn growing, experts say the dead zone is likely to expand in coming years, an environmental hazard that threatens Louisiana's sea food industry.’
      • ‘The dead zone typically begins in the spring and persists into the summer.’
      • ‘Excessive organic material in coastal waters creates a "dead zone" of almost no oxygen in the upper Texas gulf.’
      • ‘The dead zone area encompassed more than 6,000 square miles this year.’
      • ‘Some experts think the shifting winds are changing the timing of the upwelling, and in turn, the size of the dead zone.’
      • ‘The dead zone forces fish to seek better water, which may be a reason for the recent shark bites on Texas beaches.’
      • ‘However, some agricultural industry groups contend that there is not enough evidence to link farm runoff to red tides or dead zones.’
      • ‘The increasing level of bioactive nitrogen is also being cited as a cause of dead zones in the ocean due to microbial overgrowth.’
      • ‘The vast ' dead zone ' in the Gulf of Mexico is the result of intensive farming in the Mississippi River Valley.’
      • ‘More than 400 species of wildlife are threatened by a spreading "dead zone" with dangerously low levels of oxygen.’
      • ‘There are lagoons within the Nile Delta where such dead zones have already appeared.’
      • ‘In the Gulf, a growing hypoxic - oxygen-starved - dead zone is killing shellfish.’
      • ‘They knew the flooding would expand the Gulf of Mexico's dead zone.’
      • ‘Even the oceans are polluted: 7,000 square miles of the Gulf of Mexico are a dead zone.’
      • ‘The end result is a dead zone at the Gulf of Mexico that is larger than the state of New Jersey.’
      • ‘Pollution is spawning "killer algae" and ocean "dead zones."’
      • ‘Devoid of dissolved oxygen, the dead zone owed its existence to massive flows of fertilizers collected by the Mississippi and its tributaries.’
      • ‘That excessive fishing and pollution have created giant dead zones in the ocean.’
      • ‘The Gulf of Mexico, for example, contains a notorious oxygen-depleted "dead zone" caused by agricultural run-off from the Mississippi River.’
      • ‘Worldwide, there are 146 dead zones - areas of water that are too low in oxygen to sustain life.’
  • 2A place where it is not possible to receive a mobile phone or radio signal.

    • ‘Signal dead zones exist on campus, most notably the residences which apparently sit in the signal shadow of the Optometry building.’
    • ‘More, evenly spaced APs better allows the WLAN as a whole to cover dead zones.’
    • ‘For the first 20 years of cellular communications, mobile handset users have complained about dead zones, and keep switching services to get reliable connections.’
    • ‘These dead zones will most likely fall to you, the technology project manager, to install, maintain and monitor.’
    • ‘" Previously the elevator was a dead zone.’
    • ‘Single-Channel Ground-to-Air Radio System, even with the power amplifier, could not reach out of the communication dead zone surrounding the convoy.’
    • ‘My whole house seems to have turned into a wireless dead zone!’
    • ‘As one education advocate puts it, if high schools were cell phones, they would be considered in a dead zone.’
    • ‘In one case, we inadvertently put a repeater smack in the middle of a dead zone, where it sat, uselessly hunting for a signal to amplify.’
    • ‘You'd think cellphone dead zones wouldn't be a problem for Mayor Bloomberg, who travels at all times with all sorts of sophisticated communications gear.’
    • ‘The system offers a nifty solution to dead zones in your house where your cell phone doesn't work.’
    • ‘The commercial merits of the technology are self-evident: Say good-bye to dead zones and lack of interoperability between police and firefighter radios.’
    • ‘But the tester's cursor hovers aimlessly in a dead zone.’
    • ‘The area along ASR Sue is also full of communication dead zones, which are areas where very-high frequency and ultrahigh frequency signals do not propagate.’
    • ‘Heading off a dead zone, making a cell phone call during the inauguration could be a challenge.’
    • ‘Here's what you need: Oliver Burkeman's guide to the world's communication dead zones’

Pronunciation:

dead zone

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