夜不歸宿 [－－归－]

Jyutping je6 bat1 gwai1 suk1
Pinyin yè bù guī sù

Definitions (CC-CEDICT)
  1. to stay out all night (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to stay out all night; to not return home all night