Bedeutung von “complain” — Learner’s Dictionary

complain

verb [ I ] us uk /kəmˈpleɪn/

B1 to say that something is wrong or that you are annoyed about something:

Lots of people have complained about the noise.
[ + that ] He's always complaining that nobody listens to him.

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(Definition von “complain” aus dem Cambridge Learner's Dictionary © Cambridge University Press)