great deal (uncountable)

1. (idiomatic) Large number, amount, or extent.

   We have a great deal of territory to cover.

   Few expressed any great deal of confidence in the legislative branch.

   The audience is generally unaware of the great deal of work that goes into its creation.

   They didn't realize he had this great deal of intellectual depth.

   • 1977, Agatha Christie, chapter 4, in An Autobiography, part II, London: Collins, →ISBN:

     Mind you, clothes were clothes in those days. There was a great deal of them, lavish both in material and in workmanship.

2. Used other than with a figurative or idiomatic meaning: see great, deal

   I got a great deal on a motorcycle.

   There are plenty of great deals on flights.