bravo

(noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed. Synonyms: assassin, assassinator. Examples: "His assassins were hunted down like animals." "Assassinators of kings and emperors."

(noun) a cry of approval as from an audience at the end of great performance.

(verb) applaud with shouts of `bravo' or `brava'.