ㄈㄟˋfèiㄐㄧㄣˋjìnㄒㄧㄣxīnㄐㄧ

  1. 用盡心思辦法通俗常言疏證·心意·費盡心機琵琶記》:懷憂費盡心機。」盡心

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