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Definition of mouthguard noun from the Oxford Advanced Learner's Dictionary

mouthguard

noun
 
/ˈmaʊθɡɑːd/
 
/ˈmaʊθɡɑːrd/
(British English also gumshield)
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  1. a cover that a sports player wears in their mouth to protect the teeth and gums
See mouthguard in the Oxford Advanced American Dictionary

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