Longman Dictionary of Contemporary English homepage

Sense: 1
Date: 1900-2000
Origin: bubby 'breast' (17-21 centuries), perhaps from the sound of a sucking baby
Sense: 2-3
Date: 1600-1700
Language: Spanish
Origin: bobo, from Latin balbus 'stammering'

boob

1 noun
     
boob1 [countable]
1 [usually plural] informal a woman's breast
2 British English informal a silly mistake
3 American English old-fashioned a stupid or silly person
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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