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Open the tool →殚精极思 (dān jīng jí sī) is a Chinese idiom (chengyu) meaning “to rack one's brains”.
殚精极思 is pronounced dān jīng jí sī in Mandarin Chinese.
Literally, 殚精极思 means “exhaust one's mental energy and ponder deeply”. It is used to mean “to rack one's brains”.
殚:竭尽。竭尽心力思虑谋划