Sharpen
来自Big Physics
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wiktionary
From Middle English scharpenen, scharpnen, equivalent to sharp + -en.
etymonline
sharpen (v.)
1520s, "bring to an edge or point," from sharp (adj.) + -en (1). Related: Sharpened; sharpening. Old English verb scearpian meant "to score, scarify;" also compare scearpung "scarifying." To sharpen (one's) pencil "prepare to get to work" is from 1957, American English.
