Hit someone hard on the head. For example, The roof collapsed and a bunk of plaster brained him, or I'll brain you if you don't get to those dishes! This term is used both literally (first example) and hyperbolically (second example). [Slang; 1930s]
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How to use brain someone in a sentence
And yes, someone has already called Spencer a “Small Fry,” har har.Freaking Out About Age Gaps in Gay Relationships Is Homophobic|Samantha Allen|January 9, 2015|DAILY BEAST
For someone with anorexia, self-starvation makes them feel better.
“Someone is determined to keep Bill Cosby off TV,” she continued.
Binge eating and purging does the same for someone with bulimia.
But if you have a hearing and you prove that someone is mature enough, well then that state interest evaporates.
All the operations of her brain related themselves somehow to to-morrow afternoon.Hilda Lessways|Arnold Bennett
Ollie saw someone standing before it, bending slightly forward in the pose of expectation.The Bondboy|George W. (George Washington) Ogden
Persistent glycosuria has been noted in brain injuries involving the floor of the fourth ventricle.A Manual of Clinical Diagnosis|James Campbell Todd
His ear, his brain, his muscles take on a new joyous activity, and the tide of life rises higher.Children's Ways|James Sully
There was a vicious aching in his nerves, his muscles were flaccid and unstrung; a numbness was in his brain as well.The Wave|Algernon Blackwood