'step on it' definitions:

Definition of 'step on it'

From: WordNet
verb
Move fast; "He rushed down the hall to receive his guests"; "The cars raced down the street" [syn: rush, hotfoot, hasten, hie, speed, race, pelt along, rush along, cannonball along, bucket along, belt along, step on it] [ant: dawdle, linger]

Synonyms of 'step on it'

From: Moby Thesaurus