n.[C]

1. 內兄；內弟
   They are both my brothers-in-law.

   他們兩個都是我的妻舅。

2. 大伯；小叔
3. 姊夫；妹夫；連襟（包括丈夫或妻子的姊妹的丈夫）

n.

1. the brother of one's wife or husband.
2. the husband of one's sister or sister-in-law.