fastened Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to cause something to hold to another Example Sentence He fastened his seatbelt when he got into the car. Synonyms attach; anchor; clamp Antonyms undo; separate Hear It! Say It! Write It! fastened Switch to cursive Start Rhymes Two Syllable Rhymes (1) fastened Share with your friends: