What's the difference between truckle and truckling?

Truckle

Definition:

• (n.) A small wheel or caster.
• (v. i.) To yield or bend obsequiously to the will of another; to submit; to creep.
• (v. t.) To roll or move upon truckles, or casters; to trundle.

Example Sentences:

Truckling

Definition:

• (p. pr. & vb. n.) of Truckle

Example Sentences: