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Verb speed up has 2 senses
accelerate, speed up, speed, quicken - move faster; "The car accelerated"--1 is one way to intensify, deepen
 Sample sentence:
 These cars won't speed up
 
accelerate, speed, speed up - cause to move faster; "He accelerated the car"--2 is one way to modify, qualify
 Sample sentences:
 Somebody ----s something
 Somebody ----s somebody
 Something ----s somebody
 Something ----s something
 
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