Etymology
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sharper (n.)

1560s, "one who makes sharp," agent noun from obsolete verb sharp "to make sharp" (see sharp (adj.)). Meaning "swindler" is from 1680s, probably a variant of sharker (see shark (n.)). Shortened form sharpie is from 1942, also probably involving the "sharply dressed" sense of the adjective.

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Definitions of sharper

sharper (n.)
a professional card player who makes a living by cheating at card games;
Synonyms: cardsharp / card sharp / cardsharper / card sharper / sharpie / sharpy / card shark
From wordnet.princeton.edu