Meaning: If you use up something, you use all of it and have none left over.
- use up sth Do you think we'll find a new way to power cars before we use up all our oil reserves?
- use sth up I can't get any more sick days off work. I've already used them all up.
use up: resources, reserves, supplies, stocks, time
If you've used up all your prepaid phone calls, you'll have to