Meaning of “complain of sth” in the English Dictionary

british dictionary

"complain of sth" in British English

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complain of sth

phrasal verb with complain uk /kəmˈpleɪn/ us /kəmˈpleɪn/ verb [ I ]

B1 to tell other people that something is making you feel ill:

She's been complaining of a bad back recently.

(Definition of “complain of sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)