Definitions for "Dolly Grip"
A grip that moves a dolly. A dolly is a small truck which rolls along dolly tracks carrying the camera,some of the camera crew and occasionally the director. "Dolly" is also the action of moving the camera towards (dolly up/in) or away from (dolly/pull back) the object that it is pointing at.
The crew member who moves the dolly.
Crewmember who moves a dolly.