on the brain

idiom

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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Treating insomnia symptoms could very well soften the negative effects of sleep deprivation on the brain. Erica Sloan, SELF, 10 Sep. 2025 Doctors there diagnosed the infant with bleeding on the brain. Chris Ramirez, jsonline.com, 4 Sep. 2025 Scientists have long known that arsenic in drinking water is a health threat, but its affects on the brain were less clear. Austin Corona, AZCentral.com, 30 Aug. 2025 PetMD experts say that dogs who experience cognitive dysfunction have a buildup of protein known as beta-amyloid that forms plaques on the brain. Alyce Collins, MSNBC Newsweek, 20 Aug. 2025 See All Example Sentences for on the brain

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“On the brain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20the%20brain. Accessed 13 Sep. 2025.

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