D-Day Meaning in the Cambridge English Dictionary
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Meaning of “D-Day” in the English Dictionary

"D-Day" in British English

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D-Daynoun [C usually singular]

uk   us   /ˈdiː.deɪ/
the ​day during the Second World War when the Alliesbegantheir invasion of ​Europe by ​attacking the ​coast of ​northern France: The D-Day ​landingsbegan on 6 ​June 1944, when ​Alliedforcesinvaded Normandy. a ​day when something ​important will ​happen: After four ​hecticweeks of ​electioneering, ​candidates are ​preparing themselves for D-Day (= ​electionday)tomorrow.
(Definition of D-Day from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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