best boy
US /ˈbest bɔɪ/
UK /ˈbest bɔɪ/
1.
the chief assistant to the gaffer (lighting technician) or the key grip (camera and rigging technician) on a film or television set
:
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The best boy made sure all the lighting equipment was ready for the next scene.
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She started her career as a grip and worked her way up to best boy.