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]
(..) in the entire Letter Sorting department. - JUNIOR: I can't hear you! - I said that... JUNIOR: Yeah, it just sounds like "Blah, blah, blah," but mixed with crying. TULIP: But that's not what I'm... Junior, come here. JUNIOR: I can't hear what you're saying, but I assume it's lame. (..)2016 Storks