/ buːb; NAmE / noun , verb
■ noun
1.
( slang ) a woman's breast
2.
( BrE , informal ) a stupid mistake :
I made a bit of a boob throwing that file away.
3.
( NAmE ) a stupid person
■ verb
[ v ] ( informal ) to make a stupid mistake
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WORD ORIGIN
noun senses 2 to 3 and verb 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.