rack rent ------------- 高额租金

英文释义
A very high annual rent, usually equal to the full value of the property to which it relates.

例句
The greedy landlord enriched himself by insisting on making his tenants pay rack rents which kept them impoverished.
这位贪婪的房东坚持让房客支付高额租金，肥了他自己，穷了众房客。