The Collaborative International Dictionary of English v.0.48:

Truckle \Truc"kle\, n. [Dim. of truck a wheel; or from the
   kindred L. trochlea a block, sheaf containing one or more
   pulleys. See Truck a wheel.]
   A small wheel or caster. --Hudibras.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Truckle \Truc"kle\, v. i. [From truckle in truckle-bed, in
   allusion to the fact that the truckle-bed on which the pupil
   slept was rolled under the large bed of the master.]
   To yield or bend obsequiously to the will of another; to
   submit; to creep. "Small, trucking states." --Burke.
   [1913 Webster]

         Religion itself is forced to truckle to worldly poliey.
                                                  --Norris.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Truckle \Truc"kle\, v. t. [imp. & p. p. Truckled; p. pr. & vb.
   n. Truckling.]
   To roll or move upon truckles, or casters; to trundle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

truckle
    n 1: a low bed to be slid under a higher bed [syn: trundle
         bed, trundle, truckle bed, truckle]
    v 1: yield to out of weakness
    2: try to gain favor by cringing or flattering; "He is always
       kowtowing to his boss" [syn: fawn, toady, truckle,
       bootlick, kowtow, kotow, suck up]