/ Thesaurus / S Synonyms of speeded up Find synonyms for: Verb1. accelerate, speed up, speed, quicken, intensify, deepenusage: move faster; "The car accelerated"2. accelerate, speed, speed up, change, alter, modifyusage: cause to move faster; "He accelerated the car"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language