on one's mind

on (one's) mind

In one's thoughts. Jennie's been on my mind lately—do you know how she is? You look worried—what's on your mind?
See also: mind, on
Farlex Dictionary of Idioms.

on one's mind

Also, on the brain. In one's thoughts, preoccupying one. For example, The book prize has been on my mind, but I haven't been able to discuss it with you. It is often put as have something on one's mind (or the brain) meaning "be preoccupied with something," as in I didn't mean to be rude; I just have a lot on my mind right now, or John has nothing but girls on the brain. [Mid-1800s]
See also: mind, on
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • on (one's) mind
  • on mind
  • on someone's mind
  • to my mind
  • terrible
  • a mind is a terrible thing to waste
  • make mind up
  • make up (one's) mind
  • make up one's mind
  • make up your mind