a great many

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.
See also: great, many
Farlex Dictionary of Idioms.

great many

see under good many.
See also: great, many
The American Heritage® Dictionary of Idioms by Christine Ammer.

a good/great many

very 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.
See also: good, great, many
Farlex Partner Idioms Dictionary
See also:
  • great many
  • map
  • all over the map
  • great guns, going
  • great deal
  • have to go some
  • have to go some to (do something)
  • dirty great
  • great divide
  • the great divide