noun
a repayment of money
verb
to repay or return something, typically money
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I will need to pay back the loan by the end of the month.
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I owe my friend some money, so I need to pay them back soon.
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I'll make sure to pay you back as soon as I can, bro.
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Kindness is like a boomerang - it always comes back to you when you pay it forward.