Etymology and Usage
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/Schurke ("rogue" or "rascal"), as did the English word "shirk". "Sharp" developed in the 17th century from this meaning of "shark" (as apparently did the use of "shark" as a name for the fish), but the phrase "card sharp" predates the variant "card shark". The original connotation was negative, meaning "swindler" or "cheat", regardless of spelling, with the more positive connotations of "expert" or "skilled player" arising later, and not supplanting the negative ones. "Card sharp" and "card shark" are synonymous, although American English is somewhat, but informally, beginning to favor "shark" as a positive term versus "sharp" as a negative one. (However, not even all American dictionaries agree with this, and some suggest the opposite.)
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