夜不歸宿 yè bù guī sù

DEFINITIONS

  1. to stay out all night (idiom)

CHARACTERS

夜 yè
HSK 5
night, dark; in night; by night
不 bù
HSK 1
no, not; un-; negative prefix
歸 guī return; return to, revert to
宿 sù
HSK 5
stop, rest, lodge, stay overnight; constellation