noun
younger sister's husband; brother-in-law (younger sister's spouse)
Refers specifically to the husband of one's younger sister. Not used for an older sister's husband (see 姉婿).
妹婿はとても親切な人です。
My younger sister's husband is a very kind person.
先週、妹婿と一緒に釣り
Last week, I went fishing with my brother-in-law (my younger sister's husband).