Etymology
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sharper (n.)

1560s, "one who sharpens or makes sharp," agent noun from obsolete verb sharp "to make sharp" (see sharp (adj.)). The meaning "swindler, one shrewd in making bargains" is from 1680s, probably a variant of sharker (see shark (n.)). The shortened form sharpie in this sense is by 1942 (also sharpster), at that time also probably involving the "sharply dressed" sense of the adjective.

updated on August 12, 2022

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Definitions of sharper from WordNet

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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.