Source : Webster's Revised Unabridged Dictionary (1913)

Squirm \Squirm\, v. i. [imp. & p. p. {Squirmed}; p. pr. & vb. n.
   {Squirming}.] [Cf. {Swarm} to climb a tree.]
   To twist about briskly with contor?ions like an eel or a
   worm; to wriggle; to writhe.

Source : WordNet®

squirm
     n : the act of wiggling [syn: {wiggle}, {wriggle}]
     v : to move in a twisting or contorted motion, (especially when
         struggling); "The prisoner writhed in discomfort"; "The
         child tried to wriggle free from his aunt's embrace"
         [syn: {writhe}, {wrestle}, {wriggle}, {worm}, {twist}]