[uhng-kuh
l] 
| 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. | (initial capital letter) 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. |
| un·cle (ŭng'kəl) n.
[Middle English, from Anglo-Norman, from Latin avunculus, maternal uncle; see awo- in Indo-European roots.] un'cle·less adj. |
cry uncle
Also, say uncle. Concede defeat, as in The Serbs want the Bosnians to cry uncle, or If you say uncle right now, I'll let you go first in the next game. This phrase originated about 1900 as an imperative among school-children who would say, "Cry uncle when you've had enough (of a beating)." By the mid-1900s it was being used figuratively, as in the examples.