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

on one's mind

Fig. occupying one's thoughts; currently being thought about. You've been on my mind all day. Do you have something on your mind? You look so serious.
See also: mind, on

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

on someone's mind

preoccupying someone, especially in a disquieting way.
See also: mind, on