be mixed up with (someone)

be mixed up with (someone)

To be involved with someone dangerous or troublesome. I'm worried that he's mixed up with a very dangerous crowd these days.

See also: mixed, up

be/get mixed ˈup with somebody

be/become friendly with or involved with somebody that other people do not approve of: I told her I didn’t think she should get mixed up with that group, but as usual she ignored my advice.

See also: get, mixed, somebody, up