To involve or embroil one in some situation or circumstance, especially that which is problematic, unpleasant, dangerous, etc. Often used in passive constructions. I can't believe I let you mix me up in another one of your cockeyed schemes—do you know how much this is going to cost me? I don't want Sarah getting mixed up in any of your boss's illegal dealings, you hear me?

Involved or embroiled in some situation or circumstance, especially that which is problematic, unpleasant, dangerous, etc. I don't want Sarah getting mixed up in any of your boss's illegal dealings, you hear me? He's been mixed up in some pretty shady activity, from the sounds of things.