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boom

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noun American English pronunciation: boom /bum/ 
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singularboom
pluralbooms
  1. 1
    [countable/uncountable] economics a sudden major increase in trade, profits, etc. in a particular country or region

    the economic boom of the 1980s

    boom years

    1. a.
      [countable] a similar increase in the activity of a particular industry or part of a country's economy

      an export/investment/house-building boom

      boom in:

      The island is experiencing a boom in tourism.

    See also  baby boom
  2. 2
    [countable] a sudden increase in the popularity of something

    the aerobics boom of the 1980s

    boom in:

    the recent boom in Internet gambling

hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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boots on the ground

a situation in which a country's armed forces are physically present in an area of conflict …

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