Be mixed up in (something) verb phrase
If you are mixed up in something, you are involved in something, especially something illegal or dishonest.
Peter is said to be mixed up in illegal activities.
Please answer honestly! Are you mixed up in his death?
The company is mixed up in litigation over its outstanding debts. It is really difficult to explain it to the foreign partners.
To be told about and/or included in something, such as a plan or project, especially that which involves or relates to a particular group
Very busy (with something); mired in something; given too much of something.
1. Used to say that someone is in the water with sharks.
2. To be involved with devious or hazardous people.
To become involved in something that is not one's business or duty in an invasive or inquisitive manner.
The verb "be" should be conjugated according to its tense.