Synonyms of 'pay something back'
▷ See pay
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If someone refunds your money, they return it to you, for example because you have paid too much or because you have returned goods to a shop.
She will refund you the purchase price.
If you reimburse someone for something, you pay them back the money that they have spent or lost because of it.
I'll be happy to reimburse you for any expenses.
Thesaurus for pay something back from the Collins English Thesaurus