[1] : WordNet (r) 2.0

speed up
     v 1: move faster; "the car accelerated" syn: accelerate, speed,
           quicken ant: decelerate
     2: cause to move faster; "he accelerated the car" syn: accelerate,
         speed ant: decelerate
see also:
accelerate speed quicken decelerate 

[2] : Moby Thesaurus II by Grady Ward, 1.0

44 moby thesaurus words for "speed up":
   accelerate, bundle, bustle, crack on, crowd, dispatch, drive on,
   expedite, forward, gain ground, haste, hasten, hasten on, hie on,
   hurry, hurry along, hurry on, hurry up, hustle, hustle up,
   open the throttle, pick up speed, precipitate, press, push,
   push on, push through, put on, put on steam, quicken, race,
   railroad through, rev, rush, rush along, speed, speed along, spur,
   stampede, step on it, step up, urge, whip, whip along

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Bang Up >> B Words
Bang Up, definition of term: Bang Up
bang+up_pag1.html

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html