Question 1

What does "a tall order" mean?

Accepted Answer

A task or requirement that is very difficult to fulfill.

Question 2

How do you use "a tall order" in a sentence?

Accepted Answer

Finishing the entire project by tomorrow is a tall order, but we'll try.

Question 3

Is "a tall order" formal or informal?

Accepted Answer

"a tall order" is informal — used mainly in casual conversation. Used when describing challenging requests or expectations.