cudgel (one's) brains

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Related to cudgel brains: cudgel one's brains, cudgel my brain

cudgel (one's) brains

To try very hard to comprehend, solve, think of, or remember something. I was up all night cudgeling my brains for a way to pay off all my debts. She cudgeled her brains to remember the man's name.
See also: brain, cudgel