"ride shotgun : (US, idiomatic) To accompany the driver of a vehicle on a journey as an armed escort..."

“ride shotgun : (US, idiomatic) To accompany the driver of a vehicle on a journey as an armed escort (originally with a shotgun); (by extension) to accompany someone in order to assist and protect.
(US, idiomatic, by extension, slang) To ride in the front passenger seat of a vehicle, next to the driver.
(US, by extension) To supervise a process and watch for any risks.
The musical Annie Get Your Gun premiered on Broadway in New York City, New York, USA, on this day in 1946.”

- https://en.wiktionary.org/wiki/ride_shotgun#English

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