Small platforms on wheels used for moving heavy objects; or dolls/toys; or plural of names for young women (old-fashioned).
Origin unclear but possibly from the name 'Dolly' in the 1600s, or from 'doll' meaning a child's toy. Different meanings may have separate origins that got confused over time.
Film and TV cameras on 'dollies' revolutionized cinematography—they let directors create smooth tracking shots that feel like the camera is floating, which would be impossible to achieve by hand.
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