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]
(..) If I had to verify every alibi, I'd never get out of the office. But she's been suffering from an illness. Depression. Depression is just self-pity mixed with laziness. A really trendy cocktail at the moment. Maybe I could take on her shifts? Until she's back on her feet. (..)2015 Virgin Mountain