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flaw

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noun [countable] British English pronunciation: flaw /flɔː/ 
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singularflaw
pluralflaws
  1. a mistake or fault in something that makes it useless or less effective

    There are serious flaws in the way we train our teachers.

    fatal flaw (=that makes something completely useless or wrong):

    What you've just said is the fatal flaw in your argument.

    1. b.
      a fault in someone's character

      My father definitely had his flaws and failings.

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