Card sharp
The synonym to "card sharp", "blackleg", when used with reference to card-playing and swindlers, has pejorative connotations.[1] A card sharp or shark (by either of the gambling-related definitions) may be a "rounder" who travels, seeking out high-stakes games in which to gamble.According to the prevailing etymological theory, the term "shark", originally meaning "parasite" or "one who preys upon others"(cf.loan shark), derives from German Schorke or Schurke ('rogue' or 'rascal'), as did the English word "shirk[er]".[15][16] Card sharps are common characters in caper films, since the questionable legality of their hobby also plays well with that of their occupation.