it's a tall order

it's a tall order

This task, request, or order is particularly difficult to complete or accomplish. A: "The boss wants us to compile 300 pages of data today." B: "Well, it's a tall order, but I think we can manage it." I know it's a tall order to bake hundreds of cupcakes in one night, but is there any chance you could help me out?
See also: order, tall
Farlex Dictionary of Idioms.
See also:
  • that's a tall order
  • a tall order
  • 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