Comprehensive resource for understanding and mastering English idioms
The idiom "riding shotgun" means to be the assistant or helper to someone, often in a dangerous or challenging situation. It can also refer to being the second person in a car who is not driving. The figurative meaning of the idiom is to assist or support someone, even if it's not your primary role or responsibility. It can also imply that you are willing to take on additional tasks or responsibilities to help someone else.
The origin of the idiom is not entirely clear, but it's believed to have come from the military. In early times, soldiers would ride on horseback and need a second rider to help protect their flank. This second rider was known as the "shotgun" because they would fire at any enemy that came into view. Over time, the idiom has been used in other contexts beyond the military, but it still retains its original meaning of assisting or supporting someone in a dangerous or challenging situation. The usage of the idiom has varied depending on the context, but it's still commonly understood as being the second person in a car who is not driving or assisting someone in a challenging situation.