loan shark

A private individual who will, normally at grossly inflated interest rates, lend a person money. Repayment is compulsory or injury may occur. Commonly attributed to the criminal underworld
Person #1: Could I borrow a grand off you, I swear I'll pay it back.

Loan Shark: Oh, you will, believe me you will.
by Lazlo Woodbine July 24, 2004
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