A goal that is hard to fulfill or achieve, as in Getting a thousand new subscribers is a tall order indeed. This expression uses tall in the sense of “impressively great” or “difficult.” [c. 1900]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use tall order in a sentence
It really isn't a tall order to scare Americans these days, and in particular our delicate representatives in Washington.The Fear About Things That Won't Kill Us Is Killing Us | Cliff Schecter | October 25, 2014 | THE DAILY BEAST
This is a tall order, especially for a president even Sen. Dianne Feinstein calls “too cautious.”
Taking appropriate care of a broken leg in a cast can be a tall order for a young girl.Taylor Swift’s Surprise, Comic Flight Attendant, and More Viral Videos | The Daily Beast Video | April 20, 2014 | THE DAILY BEAST
If they can work something out there, even then I think a broader solution is a pretty tall order, no?
We were given a reprieve but it was still quite a tall order.
It is a pretty tall order, my friends, and be careful lest you who would destroy be not destroyed.Nat Goodwin's Book | Nat C. Goodwin
Two men being killed on one horse seems rather a tall order, yet it is perfectly true.Impressions of a War Correspondent | George Lynch
That was a tall order, and in spite of all of youth's enthusiasm was enough to make any young fellow nervous.Rung Ho! | Talbot Mundy
“A tall order that,” said Cleek with one of his curious, one-sided smiles.Cleek of Scotland Yard | Thomas W. Hanshew
It was a tall order, that; but as the bridge was up there was no other way.The Valley of Fear | Sir Arthur Conan Doyle