tall order

US /tɔl ˈɔr.dər/
UK /tɔl ˈɔr.dər/
"tall order" picture
1.

難しい注文, 困難な要求

a request or task that is difficult to fulfill or achieve

:
Finishing this project by tomorrow is a tall order.
明日までにこのプロジェクトを終えるのは難しい注文だ。
Asking him to change his mind now is a tall order.
彼に今考えを変えるように頼むのは難しい注文だ。