a bar at a reception that serves drinks whose cost has been borne by the host, an admission charge, a sponsor, etc.: Before the banquet there will be an open bar from 5 to 7 p.m.
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Compare cash bar.
Origin of open bar
First recorded in 1970–75
Words nearby open bar
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020