WordNet (r) 3.0 (2006):
slow up v 1: become slow or slower; "Production slowed" [syn: slow, slow down, slow up, slack, slacken] 2: cause to proceed more slowly; "The illness slowed him down" [syn: slow, slow down, slow up] 3: lose velocity; move more slowly; "The car decelerated" [syn: decelerate, slow, slow down, slow up, retard] [ant: accelerate, quicken, speed, speed up]