a brother of one's father or mother.

an aunt's husband.

a familiar title or term of address for any elderly man.

Slang . a pawnbroker.

( initial capital letter ) Informal . Uncle Sam.

a word formerly used in communications to represent the letter U. ?

say or cry uncle

Informal . to concede defeat

They ganged up on him in the schoolyard and made him say uncle.

adjective

associated word: avuncular , avuncular

noun

avuncularity