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complaint

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noun British English pronunciation: complaint /kəmˈpleɪnt/ 
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singularcomplaint
pluralcomplaints
  1. 1
    [countable/uncountable] a written or spoken statement in which someone says they are not satisfied with something
    make/file/lodge a complaint:

    I intend to make a complaint.

    complaint about:

    Customers lodged a formal complaint about the way they were treated.

    complaint against:

    An alarming number of complaints have been filed against him.

    complaint that:

    The council has received complaints that the building is not safe.

    investigate a complaint:

    All complaints are thoroughly investigated.

    uphold a complaint (=say it is reasonable):

    The Commission upheld the complaint under Article 13.

    grounds/cause for complaint:

    If they had a more caring attitude, we'd have less cause for complaint.

  2. 2
    [countable] an illness or other medical problem

    minor complaints like headaches

    a liver complaint

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