imōto
nounBeginner
formalinformal

Younger sister

妹は小学生です

My younger sister is an elementary school student

妹がケーキを焼いてくれた

My younger sister baked a cake for me

💡

Commonly used to refer to one's own younger sister. Can also be used to refer to someone else's younger sister in informal contexts.

Collocations

妹と遊ぶto play with one's younger sister妹の誕生日younger sister's birthday

Synonyms

Antonyms

Related Phrases

妹思いphrase
being devoted to one's younger sister

💡Pro Tip

Gender-Specific Term

妹 specifically refers to a female younger sister. For a male younger sibling, use '弟' (otōto).

Gold Rule

Family Term

妹 is a family term and should not be used to refer to non-family members unless in very informal contexts.

📖Word Origin

Composed of the kanji '女' (woman) and '妹' (younger sister), though the second character is an ateji (phonetic character used for its sound rather than meaning).

📝Usage Notes

In formal contexts, '妹さん' or '妹ちゃん' may be used to refer to someone else's younger sister. '妹' alone is typically used for one's own younger sister.

Word Breakdown

woman
root
+
younger sister
root
Noted on May 2, 2026JAEN