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A particularly difficult task to complete or accomplish. The boss wants me to compile 100 pages of data each day, which is a pretty tall order if you ask me. Baking hundreds of cupcakes in one night is a tall order, but I think we can manage it.
a request that is difficult to fulfill. (Typically: be ~; give someone ~.) That's a tall order. Do you think anyone can do it? Well, it's a tall order, but I'll do it.
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]
a tall order
COMMON If something is a tall order, it is going to be very difficult to do or get. Financing your studies may seem like a tall order, but there is plenty of help available. I've got to beat him by four shots tomorrow, and that's a very tall order. Note: An old meaning of `tall' is large or excessive.
a tall ordersomething that is difficult to accomplish.
1998 Times But the UK economy had to slow down somewhat, and gliding it down to exactly the right spot was a tall order.
a ˌtall ˈordera very difficult task or request: Finishing this work by the end of the week is a tall order, but I’ll try. OPPOSITE: child’s play
n. a request that is difficult to fulfill. That’s a tall order. Do you think anyone can do it?