Mix Up Meaning

(intransitive, usually passive, with with, often with be or get) To become involved with, especially socially or romantically.

Example:   She mixed up' peat moss, humus, and compost to make potting soil.
  She mixed up a batch of her own potting soil.
  I always mix up Vermont and New Hampshire on a map.
  I always mix up Jack with Jake.
  All the smells of the food had mixed up together.
  He got mixed up with a bad crowd.
  Then he got mixed up with an older woman.
  Now, he's mixed up with some half-baked religion.