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English definition of “concussion”

concussion

noun [U] uk   /kənˈkʌʃ.ən/ us  
temporary damage to the brain caused by a fall or hit on the head or by violent shaking: He's been a bit dizzy and confused since the accident. Do you think it's mild concussion?Losing consciousness
(Definition of concussion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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