To laugh quietly or inwardly.
To communicate through chuckling.
She chuckled her assent to my offer as she got in the car.
To make the sound of a chicken; to cluck.
To call together, or call to follow, as a hen calls her chickens; to cluck.
To fondle; to indulge or pamper.
(gerund of chuckle) An instance in which someone chuckles