プログレッシブ和英中辞典(第３版)の解説
いもうと【妹】
one's (younger) sister (▼特に区別する時以外はyoungerを省く); one's little sister; 〔義妹〕one's sister-in-law; 〔異母妹〕one's half-sister
- 末の妹
one's youngest sister - 妹婿
one's brother-in-law／one's (younger) sister's husband