/ˈmɑ:stəmaɪnd; US ˈmæs- ||; ˈmæstɚˌmaɪnd/noun [C] a very clever person who has planned or organized sth 策划人；主脑:
The mastermind behind the robbery was never caught. 策划这宗抢劫案的幕后主脑始终没有抓到。
mastermind verbThe police failed to catch the man who masterminded the robbery. 警方未能抓到策划这宗抢劫案的幕后主脑。