From Longman Dictionary of Contemporary Englishstump up (something) phrasal verb British English informalPAY FORto pay money, even if it is difficult or when you do not want to We stumped up eight quid each. → stump→ See Verb table
Examples from the Corpus
stump up • Private firms are expected to stump up £400 million of the Pounds 1.8 billion cost of the 10-mile route.• Despite poor trading, the bank stumped up another £70,000 for a second premises in Chelsea last year.• He has asked the bank's 160,000 shareholders to stump up another 90 billion roubles to finance modernisation.• Last year 1,050 people lost the right to call themselves chartered accountants because they didn't stump up by 30 June.• City must stump up the cash and planned to watch Viscaal yesterday against Mechelin.• They're hoping retired people, or those looking for a second home in the country will stump up the cash.• You read the reviews, make up your mind and stump up the cash. 