Meaning of “mastermind” in the English Dictionary

"mastermind" in American English

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mastermindverb [ T ]

us /ˈmæs·tərˌmɑɪnd/

to plan and direct a difficult activity:

Oliver masterminded the takeover of his top business competitor.
noun [ C ] us /ˈmæs·tərˌmɑɪnd/

The mastermind behind the escape has never been identified.

(Definition of “mastermind” from the Cambridge Academic Content Dictionary © Cambridge University Press)