a great many
A very large number of (people, things, etc.). A great many people have joined the protest to voice their concerns over increased taxes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
see under good many.
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.
a good/great manyvery many; a lot: A good many people think she’s right. ♢ There are a great many places in the world I’d like to visit.
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