any number of
Many; also, no particular amount of. The meaning here depends on the context. I can give you any number of reasons for John's absence means I can offer many reasons. Any number of subscribers might stay home means that an unknown number will not attend.
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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.