"loan shark"是什麼樣的鯊魚?

閱讀Reader's Digest March, 2006
看到"loan shark"這個詞：
A loan shark's late-payment fee。 
"loan shark"是什麼樣的鯊魚?

"loan shark"不是鯊魚，是「放高利貸的人」。
"Loan shark" means someone who lends money to people and charges a very high rates of interest and will often use threats or violence to get the money back. 
就英文解釋來說，這種行徑和鯊魚倒是大同小異的之處。