a good/great many

a good many

A large amount. There were a good many people doing last minute shopping at the mall on Christmas Eve.
See also: good, 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.

(a) good many

quite a few. I have a good many kinfolk in Texas. Mary owns a good many acres of land.
See also: good, many
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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:
  • a good many
  • do no good
  • for good measure
  • a good deal
  • be as good as new
  • do (one) a/the world of good
  • as good as it gets
  • (one) (has) never had it so good
  • (as) good as new
  • as good as new