Stump up
Definition 1 of 1
Pro Tip 1/3Reluctant Payment
Use 'stump up' when someone pays but doesn't really want to or feels forced. 
She didn't want the extra expense, but she stumped up for her son's school trip.
Pro Tip 2/3Slang Nuance
'Stump up' is informal and often used in casual or spoken English rather than in formal writing. 
If we all stump up a few quid, we can get the pizza ordered.
Pro Tip 3/3British and Aussie
Mainly used in the UK and Australia, so it might be unfamiliar to speakers from other regions. 
The pub's owner finally stumped up the funds for repairs.