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English definition of “brainstorm”

brainstorm

noun [C]     /ˈbreɪn.stɔːm/ US  /-stɔːrm/
UK informal a sudden state of being unable to think clearly: I must have had a brainstorm - I went shopping and forgot to take any money.Confusion, confusing and feeling confused US for brainwaveIdeas, concepts and theories
(Definition of brainstorm noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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