Meaning of “keep a/the lid on sth” in the English Dictionary

british dictionary

"keep a/the lid on sth" in British English

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keep a/the lid on sth

also put a lid on sth informal

to control the level of something in order to stop it increasing:

(Definition of “keep a/the lid on sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)