The Collaborative International Dictionary of English v.0.48:
Chuckle \Chuc"kle\, v. t. [imp. & p. p. Chuckled; p. pr. & vb.
   n. Chuckling.] [From 1st Chuck.]
   1. To call, as a hen her chickens; to cluck. [Obs.] --Dryden.
      [1913 Webster]
   2. To fondle; to cocker. [Obs.] --Dryden.
      [1913 Webster]