三更

third of the five night watch periods 23:00-01:00 (old) / midnight / also pr. [san1 jin1]

three / 3

to change or replace / to experience / one of the five two-hour periods into which the night was formerly divided / watch (e.g. of a sentry or guard)

more / even more / further / still / still more

in the depth of night / late at night

in the depth of the night; very late at night

in the depth of the night / very late at night