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Phrase(s): get away with murder
1. Lit. to commit murder and not get punished for it. (See also get away with something.) • Don’t kill me! You can’t get away with murder! 2. Fig. to do something very bad and not get punished for it. • That guy always gets away with murder—just because he’s cute. • You will spoil your son if you let him get away with murder. You should punish him for his backtalk.
McGrawhill's American Idioms And Phrasal Verbs