Tall order

//ˈtɔːl ˈɔːdə// noun

Definitions

Noun
  1. 1
    A big job; a difficult challenge. idiomatic

    "[W]e must come, consequently, to the impressive conclusion that to live on potatoes alone[…], a man must eat at least 30 lbs. of potato a day—which would be rather a tall order, even for an Irishman."

  2. 2
    a formidable task or requirement wordnet

Etymology

tall (“big, large”) + order (“request”).

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