Douglas Harper's Etymology Dictionary
Usage examples of "time-server".
Old Oinash, for ensample, is but a doddery old time-server awaiting his pension.
His councils held their share of shamans and priests, superstitious babblers and time-servers, but I had supposed that my father was sufficiently the pragmatist not to listen with overmuch attention to their cryptic advice.
Father Concha and the General were, however, far away, and all women are time-servers.
The sort of men who can be looked for under it, are either mere conformers to commonplace, or time-servers for truth whose arguments on all great subjects are meant for their hearers, and are not those which have convinced themselves.