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Phrase(s): (Has the) cat got your tongue?
Why are you not saying anything? (Often said by adults to children.) • Grandpa used to terrify me, both because he was big and fierce-looking and because he usually greeted me by bellowing, "Cat got your tongue?" • Hi, Lisa! How are you? How’s your husband? Are you surprised to see me? What’s the matter, has the cat got your tongue?
McGrawhill's American Idioms And Phrasal Verbs