更递

to change / to substitute

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

to hand over / to pass on sth / to gradually increase or decrease / progressively

to hand over; to pass on; to deliver / (bound form) progressively; in the proper order