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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، فكر خود را سخت به كار انداختن
مثال:
No matter how hard I was racking my brain, I couldn’t remember my colleague’s telephone number.
لینک کوتاه به این لغت: