How to Say "My Younger Sister" in Japanese

妹

[imo̞]

The Japanese phrase for "my younger sister" is 妹.

妹 is the general term for younger sister in Japanese. When talking about your own younger sister to someone else, you use 妹 without an honorific.

Did you know?

In some romantic contexts in older literature, 妹 was used as a term of endearment for a wife or lover, rather than a blood relative.
Depending on the social context, a person might use the phrase 妹分 to describe a woman who is not a relative but is treated as a younger sister in a mentor-protégé relationship.
The pronunciation of imōto is the result of a 'u sound shift' that also created the words kurōto for 'professional' and shirōto for 'amateur'.

私の妹は有名だ。
My younger sister is famous.
This sentence shows how to state that your 妹 is famous.
Tatoeba #162593 by bunbuku, translation #2769870 by CK
妹はもう寝ました。
My younger sister has already gone to sleep.
This sentence shows how to say your 妹 has already gone to sleep.
Tatoeba #10899868 by small_snow, translation #11043594 by CK
妹は絵が上手です。
My younger sister is good at drawing.
This sentence shows how to say your 妹 is good at drawing.
Tatoeba #10901736 by small_snow, translation #10901737 by CK
15 more sentences on Tatoeba

Two friends are talking about their families over coffee.

大翔 Hiroto

陽葵さんは妹がいますか？
Himari-san wa imouto ga imasu ka?
Himari, do you have a younger sister?
陽葵 Himari

はい、妹が一人います。
Hai, imouto ga hitori imasu.
Yes, I have one younger sister.
大翔 Hiroto

妹さんは学生ですか？
Imouto-san wa gakusei desu ka?
Is your sister a student?
陽葵 Himari

はい、高校生です。
Hai, koukousei desu.
Yes, she is a high school student.

Sources

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