expression, noun
impossible request; unreasonable proposal; tall order
Used when someone asks for something that is clearly impossible or unreasonable. Often appears in the phrase できない相談だ to reject such a request.
明日までにこの仕事を全部終わらせるなんて、できない相談だよ。
Finishing all this work by tomorrow is an impossible request.
給料
You want me to double your salary? That's an unreasonable proposal.