(1):

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

(2):

(v. t.) To fondle; to cocker.

(3):

(v. t.) To call, as a hen her chickens; to cluck.

(4):

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