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Usually rack one's brain. However, according to Oxford dictionary online, it's either:

PHRASES rack (or wrack) one's brains make a great mental effort. -

ORIGIN from Dutch rec, Low German rek 'horizontal bar or shelf', probably from recken 'to stretch, reach'.

(also suggested is that the Dutch rec (framework) leads to the Middle English rakke)

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15y ago

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Q: Is it rack brain or wrack brain?
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