To pass by (someone or something) while riding a vehicle or vehicle. I saw Tommy riding by on his brand-new bike this morning. We were taking our horses along a mountain trail when we rode by an abandoned campsite. I looked up and saw Mary riding by on a bus heading to the airport.
ride by someone or something
to pass by someone or something, riding. (As on a horse or bicycle, or as a passenger in a car.) She rode by me without saying anything. I rode by the store and forget to stop and go in.