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Phrase(s): bite one’s tongue
1. Lit. to bite down on one’s tongue by accident. • Ouch! I bit my tongue! 2. Fig. to struggle not to say something that you really want to say. • I had to bite my tongue to keep from telling her what I really thought. • I sat through that whole silly conversation biting my tongue.
McGrawhill's American Idioms And Phrasal Verbs