Murder  —n. 1 intentional unlawful killing of a human being by another. 2 colloq. Unpleasant, troublesome, or dangerous state of affairs. —v. 1 kill (a human being) intentionally and unlawfully. 2 colloq. A utterly defeat. B spoil by a bad performance, mispronunciation, etc.  cry blue murder colloq. Make an extravagant outcry. Get away with murder colloq. Do whatever one wishes and escape punishment.