chinstrap Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a strap that goes under the chin to hold something in place. Example Sentence He tightened the chinstrap so his helmet would stay on snugly. More Example Sentences He adjusted the chinstrap for a better fit. Synonyms strap; support Antonyms shoe Hear It! Say It! Write It! chinstrap Switch to cursive Start Share with your friends: