Plural of carouser; multiple people who drink and celebrate together in a lively manner.
From carouser (carouse + -er) with the standard plural suffix -s. This reflects the common practice of multiple people gathering for celebrations and drinking together.
Groups of carousers in medieval times often followed specific rules and hierarchies—the oldest would lead toasts, the newest would have to drink the most—which shows how even wild partying had structure!
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