Longman Dictionary of Contemporary English homepage

brainstorm

 noun
     
brain‧storm
1 [countable usually singular] a sudden clever idea [= brainwave British English]
2 [countable] British English informal if you have a brainstorm, you are suddenly unable to think clearly or sensibly:
I must have had a brainstorm that afternoon.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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