TAPER definition: to become gradually narrower at one end. Learn more. The meaning of TAPER is to become progressively smaller toward one end. How to use taper in a sentence. Learn the meaning of taper as a verb and a noun, with examples of usage and pronunciation. Find out how to say taper in different languages, such as Chinese, Spanish, Portuguese and Turkish. Definition of taper verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.