backfires Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to have the opposite effect than intended. Example Sentence My old car backfires all the time. More Example Sentences They hope their idea does not backfire again. Synonyms fails; misfires; backfires Antonyms succeeds; works; flourishes Hear It! Say It! Write It! backfires Switch to cursive Start Share with your friends: