From Longman Dictionary of Contemporary Englishbe/get mixed up in somethingbe/get mixed up in somethingTAKE PART/BE INVOLVEDto be involved in an illegal or dishonest activity He’s the last person I’d expect to be mixed up in something like this. I’d have to be crazy to get mixed up in that kind of thing. → mixed up
Examples from the Corpus
be/get mixed up in something• He defended me and Eddie when we got mixed up in a couple of scrapes.• We weren't going to get mixed up in a job, when we were going home off duty.• I still do not want to get mixed up in any Indochina decision...• Her son's got mixed up in it, probably demonstrated yesterday with the Socialists outside the Town Hall.• It was nothing to do with her, and whatever it was she didn't want to be mixed up in it.• Everything else about this journey is starting to get mixed up in my head.• A straight-laced Wall Street banker gets mixed up in one ludicrous misunderstanding after another in George Gallo's screwball comedy.• He had to be mixed up in the Cicero Club. 