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English definition of “caution money”

caution money

noun [U]    
LAW an amount of money that someone has to pay when they rent property, use a service, etc. which will not be returned if they damage something or owe money at the end of their contract: Each new student is required to pay a deposit of $300 as caution money on first registration.
(Definition of caution money noun from the Cambridge Business English Dictionary © Cambridge University Press)
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