1. a strap that fastens under the chin, typically used to secure a hat, helmet, or other headgear
2. a chinstrap penguin, a species of penguin found in the Southern Hemisphere with a thin black line running under its chin
Usage: often used in zoological or wildlife contexts

Examples

• The motorcycle helmet has a sturdy chinstrap to keep it secure while riding.
• She fastened the chinstrap on her riding helmet before mounting the horse.
• The soldier adjusted the chinstrap of his military cap.
• Chinstraps are one of the three main species of penguins in Antarctica.
• The chinstrap penguin gets its name from the thin black line under its chin.
• He tightened the chinstrap so his hat wouldn't blow away in the wind.