v.1. To run near or alongside someone or something: We were walking in the woods when suddenly a big moose ran by.
2. To encounter something while walking or running: We ran by two waterfalls during our hike in the mountains.
3. To tell, explain, or demonstrate something to someone: Please run those instructions by me again—I didn't hear them all.
4. To come to some place for a brief period of time: I ran by the store after work to pick up some milk.