runaway girl
Refers to a girl, typically a teenager, who has left home without permission. Often used in news reports, social discussions, or fiction.
The police took a runaway girl into protective custody.
A runaway girl was wandering around near the station.
家出 is the act of running away from home, while 家出少女 specifies a girl who has done so.
家出少年 is the male counterpart, meaning 'runaway boy'.
Compound of 家出 (running away from home) and 少女 (girl).