on one's mind
American Heritage Dictionary of Idioms:
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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]
McGraw-Hill Slang Dictionary:
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have something on the brain
tv. to be obsessed with something. (Have got can replace have.) I have money on the brain, I guess.
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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