un·cle 
(
ŭng
k
əl)
n.1. a. The brother of one's mother or father.
b. The husband of a sibling of one's mother or father.
2. Used as a form of address for an older man, especially by children.
3. A kindly counselor.
4. Slang A pawnbroker.
5. Uncle Uncle Sam.
Idiom: cry/say uncle Informal To indicate a willingness to give up a fight or surrender: tickled my brother until he cried uncle.
[Middle English, from Anglo-Norman, from Latin avunculus, maternal uncle; see awo- in the Appendix of Indo-European roots.]