狮子大开口 用英语怎么说？

It's daylight robbery.

例句:

想想看，像那样一幢小房子他们竟要价5000英镑，简直是狮子大开口！:

Fancy their asking￡5000 for a small house like that! It's daylight robbery.

the lion opened its mouth

It's a rip off. 简 直 是 敲 诈 嘛

open one’s big mouth