Examples:

• We talked to a loan shark that Leo borrowed money from.
• Anyway, your business with a loan shark is a civil matter.
• What are you, some kind of loan shark?
• I mean, what's a loan shark supposed to do?
• I started working for that loan shark in order to survive.
• He was a loan shark, fleecing people with 30% interest rates.
• It was supposed to go to my obnoxious, pushy loan shark.
• He said he went to a loan shark.
• Couple of weeks later, Jerry said he was in trouble with a loan shark.
• So, you borrowed the money from a loan shark to make the deposit.