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English definition of “D-Day”

D-Day

noun [U]     /ˈdiː.deɪ/
the day during the Second World War when the Allies began their invasion of Europe by attacking the coast of northern France: The D-Day landings began on 6 June 1944, when Allied forces invaded Normandy.Twentieth century a day when something important will happen : After four hectic weeks of electioneering , candidates are preparing themselves for D-Day (= election day ) tomorrow .Turning points and deciding moments
(Definition of D-Day noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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