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Phrase(s): Dead men tell no tales.
Prov. Dead people will not betray any secrets. • The club members liked to hold their secret meetings in a graveyard, since dead men tell no tales. • Gangster: Mugsy is going to tell the police that we robbed the bank. How can we stop him? Henchman: Dead men tell no tales.
McGrawhill's American Idioms And Phrasal Verbs