漫天要价;敲竹杠
the fact of sb charging too much money for sth
You wouldn't believe some of the prices they charge; it's daylight robbery.他们的要价有一些你都不会相信,简直就是在光天化日之下抢劫呀!
释义来自《牛津高阶英汉双解词典》第 9 版