Gaffer definitions

găf'ər
An electrician in charge of lighting on a movie or television set.
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An old man or a rustic.
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A boss or foreman.
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An old man, esp. one from the country.
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A master glass blower.
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Chief electrician in charge of lighting on a TV or film set.
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A foreman of a group of workers.
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(film) A chief lighting technician for a motion-picture or television production.
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A glassblower.

Glassblowing is a glassforming technique that involves inflating molten glass into a bubble, or parison, with the aid of a blowpipe, or blow tube. A person who blows glass is called a glassblower, glassmith, or gaffer. (2012 November)

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(colloquial) An old man.
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(UK) A foreman.
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An "Old Gaffer" is a sailor.
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In Maritime regions "the Little Gaffer" is the baby in the house.
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Origin of gaffer

From Middle English gaffe (“a hook”) + -er. The natural lighting on early film sets was adjusted by opening and closing flaps in the tent cloths, called gaff cloths or gaff flaps.