I. boob 1 /buːb/ BrE AmE noun [countable]
[ 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' ]
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
II. boob 2 BrE AmE verb [intransitive] British English informal
to make a stupid mistake SYN goof American English :
I think Jean’s boobed again.