WordReference Random House Unabridged Dictionary of American English © 2020
chin strap′, 
  1. Clothinga strap attached to a hat for passing under the chin of the wearer.
  2. Clothinga strap to support the chin in cosmetic facial treatment.
  3. a strap on a bridle or halter that joins the throatlatch and noseband.
  • 1865–70

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