tall order

A tall order is a task or job that is difficult to carry out. For a bodybuilder, lifting 500 pounds is a tall order.

Some things in life are easy to do. Some can be done with a moderate amount of effort or skill. Others are tall orders: a tall order is hard to accomplish, and it might even be impossible. Getting 100 on a test is a tall order. In sports, winning a championship is a tall order. Getting into a school like Harvard is a tall order. People often say "That's a tall order!" when someone else asks for something unrealistic.

Definitions of tall order
1

n a formidable task or requirement

“finishing in time was a tall order but we did it”
Synonyms:
large order
Type of:
labor, project, task, undertaking
any piece of work that is undertaken or attempted

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