To do your best to remember something or come up with a solution to a problem
به مغز خود فشار آوردن، فكر خود را سخت به كار انداختن
No matter how hard I was racking my brain, I couldn’t remember my colleague’s telephone number.
rack your brainsto try very hard to remember or think of something I racked my brains, trying to remember his name.
rack your brain(s)
rack your ˈbrain(s) idiom
to think very hard or for a long time about sth
• She racked her brains, trying to remember exactly what she had said.
Cambridge Advanced Learner's Dictionary - 4th Edition
rack your brains
to think very hard:
I've been racking my brains all day but I can't remember her name.
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