acidify Get Printable Handwriting (a-cid-i-fy) 4 syllables Rhymes Learn It! Spelling Test Definition verb. to make or become sour or acid to change into an acid Example Sentence We wanted for the solution to acidify. Synonyms sour; acidulate; acetify; change taste Antonyms sweeten Rhymes Four Syllable Rhymes (2) acidify solidify Share with your friends: