a tall order

Related to a tall order: not to mention, in the first place, catch up, to face the music, pat on the back, a free hand, came across

tall order

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.
See also: order, tall
Farlex Dictionary of Idioms.

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.
See also: order, tall
Collins COBUILD Idioms Dictionary, 3rd ed.

a tall order

something 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.
See also: order, tall
Farlex Partner Idioms Dictionary

a ˌtall ˈorder

a 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
See also: order, tall
Farlex Partner Idioms Dictionary
See also:
  • tall order
  • it's a tall order
  • that's a tall order
  • be a tall order
  • group
  • a committee is a group of men who keep minutes and waste hours
  • rise to the challenge
  • rise to the occasion/challenge
  • stick at nothing