WordReference Random House Unabridged Dictionary of American English © 2020
key grip′, [Motion Pictures.]
  1. Cinema, Show Businessthe chief stagehand on a movie set.
  • 1975–80

Collins Concise English Dictionary © HarperCollins Publishers::
key grip n
  1. chiefly US the person in charge of moving and setting up camera tracks and scenery in a film or television studio

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