B1 to say that something is wrong or not satisfactory抱怨;发牢骚;诉苦
B1 to tell someone formally that something is wrong投诉;控告;申诉
More examples
Over three hundred listeners phoned in to complain about the programme.
Teachers complain that more of their time is taken up with administration than with teaching.
They were afraid to complain about the noise in case they annoyed the neighbours.
She was complaining about all the sex and violence on television.
After her fall she complained that she couldn't bend her leg properly.
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