The play received 'mixed' reviews. = The play's reviews were 'mixed'. [=some critics liked the play, while other critics did not]
I accidentally 'mixed up' the two files. [=I put each of the files in the place where the other one should have gone]
He 'got mixed up in' a plan to destroy the government. [=he became involved in a plan to destroy the government]
(..) It's none of my business, but isn't a guy who can't speak in front of women gonna hold you back a little? He'll be okay once the women are mixed into the crowd. He only has a problem when they're one-on-one and smell nice. Thanks, Raj. It's vanilla oil. I was actually the one who noticed. (..)2008 TvShow: The Big Bang Theory Title: The Bat Jar Conjecture Season: 1 Episode 13