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Phrase(s): Hold your tongue!
Inf. You have said enough!; You have said enough rude things. (See also hold one’s tongue.) • Bill: You’re seeing Tom a lot, aren’t you? You must be in love. Jane: Hold your tongue, Bill Franklin! • After listening to the tirade against him for nearly four minutes, Tom cried out, "Hold your tongue!"
McGrawhill's American Idioms And Phrasal Verbs