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Noun speed up has 1 sense
  1. acceleration, quickening, speedup - the act of accelerating; increasing the speed
    --1 is a kind of speed, speeding, hurrying
    Derived forms: verb speed up1, verb speed up2
,Verb speed up has 2 senses
  1. accelerate, speed up, speed, quicken - move faster; "The car accelerated"
    --1 is one way to intensify, deepen
    Derived form: noun speedup1
    Sample sentence:
    These cars won't speed up
  2. accelerate, speed, speed up - cause to move faster; "He accelerated the car"
    --2 is one way to modify, qualify
    Derived form: noun speedup1
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
    Something ----s somebody
    Something ----s something
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