家妹 jiāmèi

jiāmèi noun younger sister
Domain: Modern Chinese 现代汉语 , Subdomain: Family 家
Notes: 家妹 is formal, in contrast to the informal 妹妹 or simply 妹. 家妹 can only be used for the speaker's younger sister (Sun 2006, loc. 977).

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Truncated for common words