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Phrase(s): Bite your tongue!
Fig. an expression said to someone who has just stated an unpleasant supposition that unfortunately may be true. • Mary: I’m afraid that we’ve missed the plane already. Jane: Bite your tongue! We still have time. • Mary: Marry him? But you’re older than he is! Sally: Bite your tongue!
McGrawhill's American Idioms And Phrasal Verbs