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doubt

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noun [countable/uncountable] doubt pronunciation in American English /daʊt/ 
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singulardoubt
pluraldoubts
  1. a feeling of not being certain about something
    doubt about/as to:

    There seems to be some doubt as to whether this is legal.

    have no/little doubt that:

    I have no doubt that he will succeed.

    there is little/no doubt that:

    There's little doubt that the measures will be extremely unpopular.

    raise doubts (=make you have doubts):

    The accident raised doubts about (=makes people have doubts about) the safety of the aircraft.

    nagging/lingering doubts:

    Nagging doubts about her story do remain.

    grave/serious doubts:

    I have serious doubts about whether this system will work.

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