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.