Definition of thunderbolt noun from the Oxford Advanced Learner's Dictionary

 

thunderbolt

 noun
noun
BrE BrE//ˈθʌndəbəʊlt//
 
; NAmE NAmE//ˈθʌndərboʊlt//
 
 
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a flash of lightning that comes at the same time as the noise of thunder and that hits something The news hit them like a thunderbolt (= was very shocking).
See the Oxford Advanced American Dictionary entry: thunderbolt