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breeding ground

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noun [countable] American English pronunciation: breeding ground 
Word Forms
singularbreeding ground
pluralbreeding grounds
  1. 1
    a situation or place in which bad things can easily begin to develop
    breeding ground for/of:

    The university was a breeding ground for political radicals.

    1. a.
      used about good things

      High-school football has always been a breeding ground for new talent.

  2. 2
    a place where animals breed

    Mosquitoes use ponds as their breeding grounds.

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