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mudguard

[muhd-gahrd]
noun
  1. Also called mud flap. splash guard.
  2. fender(def 3).
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Origin of mudguard

First recorded in 1885–90; mud + guard

splash guard

noun
  1. a large flap behind a rear tire to prevent mud, water, etc., from being splashed on the following vehicle.
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Origin of splash guard

First recorded in 1925–30
Also called mudguard, mud flap.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for mud-flaps

mudguard

noun
  1. a curved part of a motorcycle, bicycle, etc, attached above the wheels to reduce the amount of water or mud thrown up by themUS and Canadian name: fender
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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