rack your brains

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rack your brains [idiom]

To do your best to remember something or come up with a solution to a problem

به مغز خود فشار آوردن - rack your brains
Example: 

No matter how hard I was racking my brain, I couldn’t remember my colleague’s telephone number.

Longman Dictionary of Contemporary English

rack your brainsto try very hard to remember or think of something I racked my brains, trying to remember his name.

Oxford Advanced Learner's Dictionary

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

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.

© Cambridge University Press 2013

Collins Advanced Learner’s English Dictionary

phrase

If you rack your brains, you try very hard to think of something.

She began to rack her brains to remember what had happened at the nursing home.