Source : Webster's Revised Unabridged Dictionary (1913)

Bravo \Bra"vo\, n.; pl. {Bravoes}. [I. See {Brave}, a.]
   A daring villain; a bandit; one who sets law at defiance; a
   professional assassin or murderer.

         Safe from detection, seize the unwary prey. And stab,
         like bravoes, all who come this way.     --Churchill.

Bravo \Bra"vo\, interj. [It. See {Brave}.]
   Well done! excellent! an exclamation expressive of applause.

Source : WordNet®

bravo
     n 1: a murderer (especially one who kills a prominent political
          figure) who kills by a treacherous surprise attack and
          often is hired to do the deed; "his assassins were
          hunted down like animals"; "assassinators of kings and
          emperors" [syn: {assassin}, {assassinator}]
     2: a cry of approval as from an audience at the end of great
        performance
     v : applaud with shouts of `bravo' or `brava'
     [also: {bravoes} (pl)]