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good deal, a

Also, a great deal.

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1

A large but indefinite quantity, as in He has a good (or great) deal of money; also, to a large extent or degree, as in “I bled ... a great deal” (from Daniel Defoe's Robinson Crusoe, 1719). Also see good many.

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2

A very successful transaction or business agreement; a bargain. For example, The new agent got him a great deal, or Only $50,000 for all that land? That's a good deal. [Colloquial; mid-1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.