Meaning of “mastermind” - Learner’s Dictionary


verb [ T ] uk us /ˈmɑːstəmaɪnd/

to plan every detail of a complicated event or activity and make sure that it happens:

He allegedly masterminded both bomb attacks in the region.
mastermind noun [ C ]

It is thought he was the mastermind behind (= the person who planned) last year's bombing campaign.

(Definition of “mastermind” from the Cambridge Learner’s Dictionary © Cambridge University Press)