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to have somebody or something on the brain
[have] {sb/sth} on {one's} brain
to have somebody or something on the brain
01
to be unable to stop talking or thinking about someone or something
Idiom
Informal
What is the origin of the idiom "have someone or something on the brain" and when to use it?
The idiom "have someone or something on the brain" originated from the concept of the brain being the center of thought and consciousness. It suggests being preoccupied or excessively preoccupied with a particular person or thing, to the point where it dominates one's thoughts and attention. The phrase is commonly used to highlight the persistent and intrusive nature of this preoccupation.
Examples
Ever since the breakup, he has had his ex-girlfriend on the brain, constantly reminiscing about their time together.
