|Origin:||Latin avunculus 'mother's brother'|
the brother of your mother or father, or the husband of your aunt [↪ aunt]:
I went to stay with my uncle and aunt for a few days.
I was very excited about becoming an uncle (=your sister or your brother's wife has a child).
used by children, in front of a first name, to address or refer to a man who is a close friend of their parents
3 American English spoken
used by children to tell someone to admit they have been defeated