Other forms: truckled; truckles
A truckle is a trundle, a bed that tucks neatly underneath a higher bed. It's also a verb meaning to figuratively slide beneath, or submit to, the will of a more powerful person.
If you're in thrall to a charismatic, famous, or fearsome person, you may find yourself tempted to truckle: in other words, to agree with whatever they say, yield to their opinions, and otherwise make yourself (metaphorically) smaller. The original 16th-century meaning of truckle was "small wheel," like the wheels on the bottom of a trundle — or truckle — bed. The figurative truckle, "to bend obsequiously to another person," emerged in the 1800s.