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English definition of “D-Day”

D-Day

noun [U] uk   /ˈdiː.deɪ/ us  
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. a day when something important will happen: After four hectic weeks of electioneering, candidates are preparing themselves for D-Day (= election day) tomorrow.
(Definition of D-Day from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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