be in the mainstream (of something)(redirected from been in the mainstream of)
be in the mainstream (of something)
To be widely accepted and/or normalized. Lots of ideas that are currently in the mainstream weren't at one time. I mean, not that long ago, women and minorities in this country weren't allowed to vote. That hairstyle definitely isn't in the mainstream of fashion, yikes.
See also: mainstream
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.