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French word déjeuner comes from French jeûner ((intransitive) to fast; to go without food.), French dé-
jeûner (French)
(intransitive) to fast; to go without food.
dé- (French)
Used to make antonyms (similar to English prefixes un-, dis-).
déjeuner (French)
(formal) to lunch, to eat lunch, to have lunch. To have breakfast.