1 variant: 夜 yè

1 midnight

2 in the middle of the night

1 nightclub

1 night

2 classifier: 个 gè

1 nighttime

2 evening or night (e.g. classes)

1 a worthless piece of paper (idiom)

1 the people are gone and the place is empty (idiom)

2 the sight of a deserted place brings old friends to mind

3 the place is deserted

4 the birds have flown

1 lit. to make night as day (idiom); fig. to burn the midnight oil

2 work especially hard

1 to make day as night (idiom, from Book of Songs); fig. to prolong one's pleasure regardless of the hour

1 empty-handed (idiom); fig. not receiving anything