backfires Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. 1 to have results that are the opposite of what one wanted; 2 to give off a loud explosive noise that means the engine of a car or other vehicle is not working p Example Sentence My old car backfires all the time. Synonyms backlash; recoil; opposite Antonyms goes as plan Hear It! Say It! Write It! backfires Switch to cursive Start Share with your friends: