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