noun
a person in charge of lighting on a movie or TV set
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The gaffer on the film set is responsible for overseeing the lighting and camera crews.
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Hey, have you seen the gaffer around? I need to ask him something about the equipment.
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I heard the gaffer is a real pro at setting up the lights for the concert.
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In the world of soccer, the coach is often referred to as the gaffer by the players.