三更

sāngēng
  1. third of the five night watch periods 23:00-01:00 (old)
  2. midnight
  3. also pr. sānjīn

CEDICT

old

Entry Composition

1 三 sān
  1. three
  2. 3
2 更 gēng
  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)