Tanning
来自Big Physics
late Old English tannian ‘convert into leather’, probably from medieval Latin tannare, perhaps of Celtic origin; reinforced in Middle English by Old French tanner . Early use of the noun (late Middle English) was in tan1 (sense 3 of the noun).
etymonline
tanning (n.)
late 15c., "process of tanning leather," verbal noun from tan (v.). Intransitive sense "process of getting suntan" is from 1944.
