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English definition of “thunderbolt”

thunderbolt

noun uk   /ˈθʌn.də.bəʊlt/ us    /-dɚ.boʊlt/

thunderbolt noun (THUNDER)

[C] a flash of lightning and the sound of thunder togetherStormy weatherWind and winds

thunderbolt noun (SURPRISE/SHOCK)

[S] an announcement, event, or idea that is completely unexpected or shocking: He dropped a thunderbolt on us this morning, when he told us that we were closing down.Surprising and shockingMaking people sad, shocked and upset
(Definition of thunderbolt from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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