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proper noun

Jour J

/ʒuʁ ʒi/

proper noun/ʒuʁ ʒi/

D-Day (“6 June 1944”) (WWII); The date of any major event planned for the future.

From jour + J. From J for jour (“day”). Calque of English D-Day, from D + day, D itself standing for day. From U.S. military terminology.

Jour J — French Dictionary | Passage