A protective mouthguard worn during contact sports to protect teeth and gums from injury.
From 'gum' (the soft tissue around teeth) plus 'shield' (protective covering). The term developed in the 20th century as contact sports safety equipment became standard.
Gumshields are a perfect example of how language and safety evolved together—athletes didn't have them until the late 1800s, and now kids wear them as routinely as they do helmets, with the word itself being only about 100 years old!
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