chinstrap Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a strap attached to headgear as a hat and connecting under the chin to hold it securing in place Example Sentence He tightened the chinstrap so his helmet would stay on snugly. Synonyms strap; hat strap; headgear strap Antonyms shoe Hear It! Say It! Write It! chinstrap Switch to cursive Start Share with your friends: