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To pay the required amount of money, especially unwillingly or reluctantly. A noun or pronoun can be used between "stump" and "up." Primarily heard in UK. I hate having to pay for more repairs already, but it's still cheaper to just stump up the cash than go buy a whole new car. The company was found liable for costs by the jury but has so far refused to stump the money up.
1. To provide some funds or capital: An investor stumped up the money to expand the business.
2. To pay some amount of money, often reluctantly: We had to stump up $30 just to get inside.