uncle

noun9

1. •
   a brother of someone's mother or father, or a man married to a sister of either of them
2. •
   The male cousin of one’s parent.
3. •
   Used as a fictive kinship title for a close male friend of one's parent or parents.
4. •
   An affectionate term for a man of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.
5. •
   (Singapore, informal) Any middle-aged or elderly man older than the speaker and/or listener.
6. •
   (figurative) A source of advice, encouragement, or help.
7. •
   (euphemistic) Used as a title for the male companion to one's (usually unmarried) parent.
8. •
   (informal, old-fashioned) A pawnbroker.

   • December 1843, William Makepeace Thackeray, "Grant in Paris" (review), in Fraser's Magazine A chain hangs out of the pocket of his velvet waistcoat , by which we may conclude that he has a watch , though we have known many gents whose watches were at their uncle's (as the fashionable term for the pawnbroker goes)
9. •
   (slang, no longer used) An older African-American male.

   • Plain old uncle as he [Socrates] was, with his great ears, — an immense talker. — 1850

verb2

1. •
   (informal) To act like, or as, an uncle.

   • Betelgeuse Five, where he both fathered and uncled Ford — 1979
2. •
   (informal) To address somebody by the term uncle.

exclamation1

1. •
   (US, informal) A cry used to indicate surrender.

noun1

1. •
   radiotelephony clear-code word for the letter U.