Keyword
younger sister
Info
FrequencyTop 500-600
Type
Kyōiku (2nd grade) 
?
KankenLevel 9
Heisig234
Readings
まい
(23%)
だい
(7%)
Composed of
woman
not yet
Mnemonic

A younger sister is someone that has not yet become a woman.

Used in vocabulary (73 in total)
younger sister
older brother and younger sister
Examples (200 in total)
Your younger sister is a very kind girl.
What I want to know is why you got close to my sister.
Since I am the older brother, I must protect my younger sister.