- 1the brother of your mother or father; the husband of your aunt Uncle John I'm going to visit my uncle. I've just become an uncle (= because your brother/sister has had a baby).
- 2used by children, with a first name, to address a man who is a close friend of their parents Idioms
to admit that you have been defeated in a fight and want to give up The older boys made Jimmy cry uncle.
Check pronunciation: uncle