Spread the word: STUMP UP SG

To stump up is a British slang phrase. Can you find out its meaning based on the sentences given below?

"On Wednesday he provided rather thin answers to questions from the Liberal Democrat's Mike Tuffrey about the financing of his Thames cable car project and the true value of the contribution by airline sponsor Emirates. Originally this venture too was to have been paid for without public money, yet £60 million has already been stumped up with no clear picture of how much of that sum might be recouped or when." from the Guardian

"The Local Lend a Hand scheme was launched earlier this year, with councils stumping up 20% of the value of a property which goes straight to the bank rather than to the house buyer." from BBC

And here is the definition from Cambridge Dictionary Online:

to pay an amount or type of money for something, especially unwillingly

The American phrase is to pony up. 

"Moody’s Investors Services thought so, and followed through Friday with its well-flagged plans to take the ratings of 12 major U.K. financial institution down a few notches, citing intentions of the government to distance itself from having to pony up the cash as lender of last resort." from The WSJ

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