Brewer's: Cudgel One's Brains

(To). To make a painful effort to remember or understand something. The idea is from taking a stick to beat a dull boy under the notion that dulness is the result of temper or inattention.

“Cudgel thy brains no more about it; for our dull ass will not mend his place with beating.” —Shakespeare: Hamlet, v. 1.

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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