弟， おとうと， てい

1. younger brother, little brother, kid brother 2. brother-in-law (spouse's younger brother or younger sister's husband) 3. pupil, apprentice

弟弟，小弟，小兄弟；姐夫/妹夫（配偶的弟弟或妹妹的丈夫）；学生，学徒

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