殫daan1精zing1竭kit3慮leoi6

simp殚精竭虑

daan1 zing1 kit3 leoi6dān jīng jié lǜ

English

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

Sources: cc-cedict, rime-cantonese

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