be a tall order

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be a tall order

To be a difficult task to complete or accomplish. The boss wants me to compile 300 pages of data today, which is a tall order. Baking hundreds of cupcakes in one night is a tall order.
See also: order, tall

be a tall order

if a piece of work or request is a tall order, it is very difficult to do 'They've given us three weeks to get the project finished.' 'That's a tall order.'
See also: order, tall