Sharper
来自Big Physics
Old English sc(e)arp, of Germanic origin; related to Dutch scherp and German scharf .
wiktionary
sharp + -er
etymonline
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.
