In saddlery, a strap connecting the throat-strap and nose-band of a halter.(noun)
A strap which passes under the jaw of a horse and connects with the nose-piece and bridle-checks.(noun)
The Century Dictionary (Public Domain)
Use "chin-strap" in a sentence
"In place of that padded skull-cap with chin-strap, Petr Cech might at least consider adopting a fearsome Highlander style Kurgan skull-helmet, while for all we know, the increasingly effete flower Fernando Torres could be just one left-up toilet seat from hitting the richest vein of scoring of his career."
"Mr. Ryan anticipated a "triple chin-strap game" against the Steelers on frozen turf that felt more like concrete than sod."
"Then he passed a little bottle to his brother, and Charles attended to the chin-strap mark that would have betrayed him a British officer in any light brighter than dusk."