Pronunciation: (ung'kul),[key] —n. 1. a brother of one's father or mother.
2. an aunt's husband.
3. a familiar title or term of address for any elderly man.
4. Slang.a pawnbroker.
5. (cap.) Informal.Uncle Sam.
6. a word formerly used in communications to represent the letter U. 7. say or cry uncle,Informal.to concede defeat: They ganged up on him in the schoolyard and made him say uncle.