To be constantly moving your head left and right so that you do not miss anything approaching you from a blind spot
Mandy had her head on a swivel as she rode her bicycle in downtown traffic in order to avoid getting hit by a car.
by Chow-bi July 5, 2017
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To be alert, or just be watching around you
Guy1: Cops is lurking, keep your head on a swivel
Guy2: Aight g, you too
by TexasMadeCuzzo December 8, 2016
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