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fault

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noun fault pronunciation in British English /fɔːlt/ 
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singularfault
pluralfaults
  1. 1
    [countable/uncountable] the fact of being responsible for a bad or unpleasant situation
    be someone's fault:

    It's my fault – I forgot to give him the message.

    be someone's fault (that):

    It's not my fault that we're late.

    be someone's own fault:

    If you didn't get enough sleep, it's your own fault.

    be all someone's fault:

    We've missed the plane and it's all your fault!

    be someone's fault for doing something:

    It was partly the teacher's fault for not explaining things clearly enough.

    through no fault of your own:

    He seems to have lost the job through no fault of his own.

    the fault lies with:

    If a child does not attend school, the fault lies with the parent.

  2. 2
    [countable] a feature of something that makes it less good

    The book's main fault is that it is too long.

    for all something's faults (=despite them):

    For all its faults, it is still the best small car on the market.

    1. a.
      a problem with a machine or piece of equipment that stops it from working correctly
      fault in:

      An engineer was called out to repair a fault in the alarm system.

      an electrical/mechanical/technical fault:

      The fire was caused by an electrical fault.

    2. b.
      a bad part of someone's character

      She has her faults, but on the whole she's very nice.

      for all someone's faults (=despite them):

      For all his faults, he's been a very good friend to me.

  3. 4
    [countable] science a crack on or below the Earth's surface

    a geological fault

    the San Andreas Fault

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