gumshield
/ˈɡʌmˌʃild/
noun
- A protective device worn inside the mouth to protect the teeth and gums, especially in sports like boxing or rugby.
- Every boxer must wear a gumshield during a match to prevent dental injuries.
- He bit down on his gumshield as the referee gave the final instructions.
- She bought a new gumshield for her son's rugby season.