brain Definition in Cambridge British English Dictionary
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Definition of "brain" - British English Dictionary

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brainnoun

uk   us   /breɪn/
A2 [C] the organ inside the head that controls thought, memory, feelings, and activity: Doctors tried desperately to reduce the swelling in her brain. The accident left him with permanent brain damage. His wife died from a brain tumour.C1 [C] used to refer to intelligence: Marie has an amazing brain (= is very intelligent). That can't possibly be the right way to do it - use your brain! The poor child inherited his mother's brains and his father's looks. He's got brains but he's too lazy to use them (= he is intelligent but lazy). [C usually plural] informal a very intelligent person, especially one who has spent a lot of time studying: We have the best brains in the land working on this problem.the brains [S] the most intelligent person in a group, especially the person who plans what the group will do: My little brother's the brains of the family.
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brainverb [T]

uk   us   /breɪn/ informal
to hit someone on the head: I'll brain you if you don't keep quiet.
(Definition of brain from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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