To yield or bend obsequiously to the will of another; to act in a subservient manner.
Truckle is from truckle in truckle bed (a low bed on wheels that may be pushed under another bed; also called a trundle bed),in reference to the fact that the truckle bed on which the pupil sleptwas rolled under the large bed of the master. The ultimate source ofthe word is Greek trokhos, "a wheel."
Example:
While the Democrats may be the current majority party, I refuse to truckle from my conservative Republican beliefs.