dol·ly 
(dŏlē)
(dŏlē)n. pl. dol·lies
1. Informal A child's doll.
2.
a. A low mobile platform that rolls on casters, used for transporting heavy loads.
b. Such a platform as used by one working underneath a motor vehicle.
c. A hand truck.
3.
a. A wheeled apparatus used to transport a movie camera steadily along the ground or along a track.
b. A movie shot made by a camera moving steadily on a dolly; a tracking shot.
4. A small locomotive, as for use in a railroad yard or on a construction site.
5. A wooden implement for stirring clothes in a washtub.
6. A tool used to hold one end of a rivet while the opposite end is being hammered to form a head.
7. A small piece of wood or metal placed on the head of a pile to prevent damage to the pile while it is being driven.
intr.v. dol·lied, dol·ly·ing, dol·lies
To move a dolly in a specified direction: The camera dollied left, keeping the actors in the frame.