good deal, a
a good deal
A large degree or amount, usually indefinite or intangible. There's a good deal to be learned from listening to your elders. I own a good deal of books at home. They're starting to clutter up the place. We'll need a good deal more if we're going to have enough.
1. A very favorable agreement, cost, or situation. We never thought we'd be able to afford a neighborhood like this, but we got a good deal on this house.
2. An acknowledgment that a situation or proposal is acceptable, pleasing, or fortuitous. A: "I'll plan on coming around this Friday evening." B: "Good deal, buddy."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
good deal, a
Also, a great deal.
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.
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]
See also: good
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.