English dictionary clam up meaning and definition Definition and meaning of clam up at MeaningMonkey.org. clam up meaning and definition in the English Dictionary. CLAM UP verbDefinition of clam up (verb)refuse to talk or stop talking; fall silent"The children shut up when their father approached"synonyms: be quiet, belt up, button up, close up, dummy up, keep mum, shut upantonym: open up Source: Princeton University Wordnet
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