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English definition of “thunder”

thunder

noun uk   /ˈθʌn.dər/ us    /-dɚ/
B1 [U] the sudden loud noise that comes from the sky especially during a storm: a clap of thunder thunder and lightning [S] a continuous loud noise: I couldn't hear what he was saying over the thunder of the waterfall.

thunder

verb uk   /ˈθʌn.dər/ us    /-dɚ/
[I] When it thunders, a loud noise comes from the sky: The sky grew dark and it started to thunder. [I + adv/prep] to move, making a lot of noise: The train thundered past, shaking the whole house. [I] to shout angrily: [+ speech] "I never want to see you here again!" he thundered.
thundering
noun [U] uk   /-ɪŋ/ us  
We could hear the thundering (= continuous loud noise) of the guns all night.
(Definition of thunder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of thunder?
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