Definition of «chin strap»

The phrase "chin strap" refers to a band or strap that keeps a hat or helmet securely fastened under your chin to prevent it from falling off.

The hat has an adjustable elastic chin strap that will keep your hat in place. (whatbabyneedslist.com)
They have branch loops, and an adjustable chin strap so they will fit everyone just right. (geekwrapped.com)
The nylon straps, pinch guard chin strap, and adjustable fit dial all help to keep your child safe in the event of a fall. (tinyfry.com)
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