費盡心機 [费尽－机]

Jyutping fai3 zeon6 sam1 gei1
Pinyin fèi jìn xīn jī

Definitions (CC-CEDICT)
  1. to rack one's brains for schemes (idiom)
  2. to beat one's brains out
Definitions (Wiktionary)
  1. phrase, idiomatic
    rack one's brains; beat one's brains out