Chuckle

v. t.
  1. To call, as a hen her chickens; to cluck.
  2. To fondle; to cocker.

n.
  1. A short, suppressed laugh; the expression of satisfaction, exultation, or derision.

v. i.
  1. To laugh in a suppressed or broken manner, as expressing inward satisfaction, exultation, or derision.