rack one's brain
idiom
: to think very hard in order to try to remember something, solve a problem, etc.
I've been racking my brain, but I can't remember his name.
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“Rack one's brain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rack%20one%27s%20brain. Accessed 19 Apr. 2024.
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