1 variant: 夜 yè

1 nighttime

2 evening or night (e.g. classes)

1 to change or replace

2 to experience

3 one of the five two-hour periods into which the night was formerly divided

4 watch (e.g. of a sentry or guard)

1 to replace the old with new

2 to renew

3 to renovate

4 to upgrade

5 to update

6 to regenerate

1 in the depth of the night

2 very late at night

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 (idiom) to continue in the same old rut

2 diehard conservative attitudes

1 hidebound by convention (idiom)

1 to work from morning to night (idiom)