The phrase "rode shotgun for" is typically used to describe someone who rides in the front passenger seat of a vehicle. In this context, antonyms for "rode shotgun for" may include "rode in the backseat," "rode in the middle seat," or "rode in the rear seat." These antonyms indicate that the person did not occupy the coveted front seat. Other possible antonyms for this phrase could include "walked," "took public transportation," or "drove their own vehicle." Regardless of the antonym used, it implies the person did not have the privilege of sitting in the front seat of a car.