have a run—
1. make an outing or a short journey in a car, etc.:
- If it’s fine to-morrow we’ll have a run in the new car.
2. have a tear in a knitted garment:
- I had an awful ladder in my stocking … I scarcely ever have a run now.
have the runs —(coll.) have diarrhea:
- My cat had the runs a while ago. You have to give him a special human quality diet for a while.