one's pound of flesh残酷榨取；割肉还债相信大家都看过莎士比亚的《威尼斯商人》。这里就不加以介绍。one's pound of flesh比喻to insist cruelly on repayment of what was borrowed，常用在have，demand，exact，want，ask for 等之后。

　　eg：If you borrow from the scoundredl，you may be sure he'll demand hhis pound of flesh. Their boss pays the highest wages，but he wants his pound of flesh in return and makes them work very hard.