Meaning

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

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

verb applaud with shouts of `bravo' or `brava'

originEtymology tree Spanish Bravobor. English Bravo Borrowed from Spanish Bravo.

Etymology from Wiktionary, CC BY-SA 3.0