A strap or band that is fastened under the chin to hold a hat or helmet in place.
Early 19th century. from chin + strap.
- The football player wore a helmet with a chinstrap.
- The chinstrap kept the hat from flying off in the wind.
- The chinstrap was adjusted to fit the player's chin.
- The chinstrap was made of durable material that wouldn't break easily.
- The chinstrap was an important safety feature for the helmet.