Here is another American slang phrase for students learning English for academic purposes.
Phrase: To ride shotgun/ to call shotgun
Definition: To ride in the front seat of the car
Where it came from: The imagery invoked by the phrase comes from stagecoaches, specifically the person who rode in the seat next to the driver whose job was to fend off any would-be bandits with a shotgun.
Example: “I’m going to the mall, anyone want to come?” “Yes, I call shotgun!”