破瓜

Etymology
The shape of the character can be decomposed into two, thus “breaking 瓜” is used to euphemistically refer to reaching the age of 8+8 (=16) for girls, and 8×8 (=64) for men.

Verb

 * 1)  to reach the age of 16
 * 2)  to lose one's virginity
 * 3)  to reach the age of 64

Etymology
Similar to the sense development of 🇨🇬, the shape of the character can be  or decomposed into two  characters, thus “breaking 瓜” is used to euphemistically refer to reaching the age of 8+8 (=16) for girls, and 8×8 (=64) for men.

The girls' age sense is cited to the late 1600s. The men's age sense is cited to the early 1700s. The sexual sense is cited to the late 1800s.

Noun

 * 1) the age of 16 for a girl
 * 2) the age of 64 for a man
 * 3)  the breaking of the hymen through sexual intercourse
 * 4)  hebephrenia, disorganized schizophrenia: a type of schizophrenia with onset typically occurring during adolescence

Derived terms

 * : adolescence, puberty
 * : hebephrenia