tall order

But, Mr. Reiner explains, it was a tall order to persuade financiers of the possibilities of an imitation documentary about a nonexistent band.

He added: "It's a tall order. Barbara Broccoli and Michael G Wilson did such a remarkable job over the years."

I hope they are right, but getting Americans to eat more bok choy—and less bratwurst—would be a tall order.

Finding a song that sounds like “The Life of a Showgirl” is a tall order, if not an impossible one.

That, Mr Childs adds, will be a "very tall order".