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traffic cop

noun Informal.
  1. a police officer who directs the flow of traffic, usually at an intersection.
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Origin of traffic cop

An Americanism dating back to 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for traffic cop

traffic cop

noun
  1. informal a policeman who supervises road traffic
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012