on the brain

phrase

informal
: always in one's thoughts
I've had pizza on the brain all day.
He's got sex on the brain.

Examples of on the brain in a Sentence

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Doing both puts a lot of stress on the brain when temperatures rise, and some people are incredibly sensitive to it. — Mark Prussin, CBS News, 29 June 2026 These deep-learning methods are roughly based on the brain’s structure, with many layers of code linked together like neurons, and weights given to the links changing as the network picks up patterns. — IEEE Spectrum, 20 Apr. 2021 Native to the Pacific Islands, its active compounds (kavalactones) act directly on the brain's GABA receptors much like a mild sedative and are typically used for acute anxiety or insomnia. — Jesse Pines, Forbes.com, 4 July 2026

Rhymes for on the brain

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on the books
on the brain
on the bright side
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“On the brain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20the%20brain. Accessed 8 Jul. 2026.

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