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Pronunciation varies by accent · noun
(US) A device that fits into the mouth over one or both arches of the teeth and usually made of plastic. Such devices may protect against injury during sport or fighting or may serve a medical purpose..
Use mouth guard when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Mouth guard means (US) A device that fits into the mouth over one or both arches of the teeth and usually made of plastic. Such devices may protect against injury during sport or fighting or may serve a medical purpose..
Common synonyms include gumshield.
The opposite depends on the specific sense.
Use mouth guard where its definition matches the intended context.
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