Definition of boob noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//buːb//
    ; NAmE NAmE//buːb//
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  1. 1(slang) a woman’s breast
  2. 2(British English, informal) a stupid mistake I made a bit of a boob deleting that file.
  3. 3(North American English) a stupid person
  4. Word Originnoun senses 2 to 3 early 20th cent.: abbreviation of booby ‘stupid person’. noun sense 1 1950s (originally US): abbreviation of booby ‘woman's breast’, from dialect bubby, of uncertain origin; perhaps related to German dialect Bübbi ‘teat’.