open bar

noun
🔊/ˌəʊpən ˈbɑː(r)/
🔊/ˌəʊpən ˈbɑːr/
[uncountable, countable]
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  1. an occasion when all the drinks at a party or other event have been paid for by somebody else or are included in the ticket price(聚会等场合的)酒水免费,酒水已付