The phrase "rides shotgun for" often implies that someone is sitting in the passenger seat of a car, typically serving as a co-pilot or assistant to the driver. However, there are several antonyms that can be used to describe the opposite scenario. For example, "rides in the backseat" suggests that someone is taking a secondary or passive role in the journey, while "drives solo" indicates that someone is the sole driver of the vehicle. Other antonyms include "sits out the ride," "lets someone else take the wheel," or "opts out of the passenger role." Overall, these antonyms provide a variety of ways to describe different positions and responsibilities within a vehicle.