殚精竭虑殫精竭慮

dān jīng jié lǜ

Meaning

to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly; to rack one's brains; to leave no stone unturned

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Characters

殚dānutmost, entirely, quite; to use up歹单精jīngessence, germ, spirit米青竭jiéto exhaust; to put forth great effort立曷虑lǜanxious, concerned, worried虍心