A large amount or many; lots of (borrowed from French, used in English to emphasize quantity).
From French 'beaucoup,' from Old French 'beau' (fine, beautiful) + 'coup' (blow, strike). Originally meant 'a fine blow,' evolved to mean 'a lot' or 'much.' English borrowed this as a casual intensifier.
English speakers use 'beaucoup' as slang because French sounds fancy, even though the original French phrase just means 'many.' It's pure style over substance—the French speaker sounds more sophisticated!
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