n.

1. 伯父；叔父；姑父；姨丈；舅父
   My uncle has a good sense of humor.

   我的叔叔很有幽默感。

2. （用于对年长男子的称呼）大叔；叔叔，伯伯
   Jimmy is uncle to all the kids who like to go boating with him.

   那些喜欢和吉米一起乘船游玩的孩子都把他当叔叔。

n.

1. the brother of one's father or mother or the husband of one's aunt.
   ▸informal an unrelated adult male friend of a child's parents.
2. archaic, informal a pawnbroker.