early 15c., "one who shaves or cuts hair," agent noun from shave (v.); sense of "fellow, chap" is slang from 1590s. Meaning "shaving tool" is from 1550s (as a kind of medical instrument, early 15c.). Mad shaver (1610s) was 17c. slang for "a swashbuckler, roisterer."
updated on August 12, 2022