put great effort to think of or remember something
thinking about something vigorously thus stretching one’s brains
struggling hard trying to remember something
I have been racking my brain all day trying to think of place where I kept my car keys.
He had been racking his brains for an idea of a surprise party to her mother on her birthday when his friend arrived and told him of the new place in the city.
The detective kept racking his brain to solve the mystery when his eyes got stuck at the evidence kept on the table.
Do not rack your brain trying to plan for her birthday party. She is going to a hill station with her family a week before.
I racked my brain trying to remember a friend’s phone number after having lost my phone but failed. The next hour she called and I felt sigh of relief.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.