Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb speed_up

2 senses of speed up

Sense 1
accelerate, speed up, speed, quicken -- (move faster; "The car accelerated")
       => intensify, deepen -- (become more intense; "The debate intensified"; "His dislike for raw fish only deepened in Japan")

Sense 2
accelerate, speed, speed up -- (cause to move faster; "He accelerated the car")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")