外泊 がいはく
gaihaku

Noun
Suru Verb

1. staying somewhere else (overnight); spending the night away (e.g. from home); going home (e.g. from hospital) for the night; sleepover

Intransitive
ちち外泊 がいはくするときはたいてい帽子 ぼうしをかぶる。
chichiwa gaihaku suru tokiwa taitē bōshio kaburu.
My father usually wears a hat when he goes out for the night.