Boob
来自Big Physics
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early 20th century: abbreviation of booby1.
wiktionary
Clipped form of booby(“fool”). Appeared near the beginning of the twentieth century; more information at booby § Etymology 1.
Clipped form of booby(“breast”). Appeared from the 20th century; more information at booby § Etymology 2.
Apparently shortened from booby-hatch.
etymonline
boob (n.)
"stupid person," 1909, American English slang, perhaps a shortening of booby. For the "woman's breast" sense, see boobs. Mencken seems to have coined booboisie (1922).
