Synonyms of 'pay up'
▷ See pay
payDictionary, fork out (informal) , stump up (British , informal)
We claimed a refund, but the company wouldn't pay up.
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Thesaurus for pay up from the Collins English Thesaurus
If you pay up , you give someone the money that you owe them or that they are entitled to, even though you would prefer not to give it.