to laugh softly or amusedly, usually with satisfaction

They chuckled at the child's efforts to walk.

to laugh to oneself

to chuckle while reading.

Obsolete . to cluck, as a fowl.

a soft laugh, usually of satisfaction.

Obsolete . the cluck of a hen.

verb

cackle , chortle , crow , exult , guffaw , hee-haw , laugh , smile , snicker , snigger , sniggle , teehee , titter , giggle