Beaucoup

google

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French, ‘a large quantity, a lot’.

wiktionary

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Borrowed from French beaucoup. Popularized by the American GIs during the Vietnam War.

etymonline

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beaucoup

French, literally "a great heap" (13c.), from beau "fine, great" (see beau (n.)) + coup "a stroke," also "a throw," hence, "a heap" (see coup (n.)). Compare Spanish golpe "multitude," from the same Latin source.