Source : Webster's Revised Unabridged Dictionary (1913)

Chuckle \Chuc"kle\, v. t. [imp. & p. p. {Chuckled}; p. pr. & vb.
   n. {Chuckling}.] [From lst {Chuck}.]
   1. To call, as a hen her chickens; to cluck. [Obs.] --Dryden.

   2. To fondle; to cocker. [Obs.] --Dryden.