accelerate, bundle, fast-track, hasten, hurry, quicken, rush, whisk

drive, goad, prod, propel, push, race, spur, stir, urgeaid, dispatch, ease, encourage, expedite, facilitate

brake, decelerate, retard, slow (down)

delay, encumber, fetter, hamper, hinder, hobble, hold back, hold up, impede, interfere (with), manacle, rein (in), restrain, shackle, tie up, trammelarrest, check, stall, stay, still, stop