費盡心機

fèijìnxīnjī

rack one's brains (in scheming); tax one's ingenuity

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fei4 jin4 xin1 ji1

to rack one's brains for schemes (idiom), to beat one's brains out

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費盡心機|费尽心机 [fèi jìn xīn jī] ► to rack one's brains for schemes (idiom) ► to beat one's brains out