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Meaning of “brain” - Learner’s Dictionary

brain

noun     /breɪn/
ORGAN [C]
A2 the organ inside your head that controls your thoughts, feelings, and movements: brain damage The brain and nervous system
PERSON [C] informal
an extremely intelligent person: [usually plural] This university attracts some of the best brains in the country.IntelligencePerceptive
brains
intelligence: He has brains and good looks.IntelligencePerceptive
have sth on the brain informal
to think or talk about something all the time: You have football on the brain!Continually thinking about
the brains behind sth informal
the person who has planned and organized something successful: Anthony is the brains behind the project.IntelligencePerceptive
(Definition of brain from the Cambridge Learner’s Dictionary © Cambridge University Press)
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