The phrase "stepping on it" refers to accelerating or speeding up. Antonyms for this phrase would include terms such as decelerate, slow down, brake, and reduce speed. These are all actions that have the opposite effect of stepping on it and are often necessary for safety while driving. Other alternatives to "stepping on it" include cruising, maintaining the speed limit, and driving within a comfortable range. Using antonyms for "stepping on it" can enhance the overall driving experience and help promote a sense of responsibility and awareness while on the road.