diminishing Get Printable Handwriting Rhymes Learn It! Spelling Test Definition verb. to make smaller in amount or volume or extent Example Sentence Our supplies are diminishing rapidly. Synonyms lessen; decrease; reduce Antonyms increase Rhymes Three Syllable Rhymes (1) finishing Four Syllable Rhymes (2) diminishing refinishing Five Syllable Rhymes (1) photofinishing Share with your friends: