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English definition of “thunder”

thunder

noun [U]  /ˈθʌn·dər/ us  
the sudden, loud noise that comes after a flash of lightning: a clap of thunder

thunder

verb [I]  /ˈθʌn·dər/ us  
to produce thunder after a flash of lightning: The sky grew dark and it started to thunder. The horses thundered past (= moved making a lot of noise), shaking the house.
(Definition of thunder from the Cambridge Academic Content Dictionary © Cambridge University Press)
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