a mechanism that intermittently advances the film through the film gate of a camera or projector.
Origin of pulldown
First recorded in 1950–55; noun use of verb phrase pull down
designed to be pulled down for use: a pull-down bed; a desk with a pull-down front.
Origin of pull-down
First recorded in 1905–10; adj. use of verb phrase pull down
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019