rack one's brain

[rack one's brain] {v. phr.}

To try your best to think; make a great mental effort; especially: to try to remember something you have known.

* /Bob racked his brain trying to remember where he left the book./

* /Susan racked her brain trying to guess whom the valentine came from./

* /John racked his brain during the test trying to solve the problem./

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Source: A Dictionary of American Idioms


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