Definitions for open bar
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Random House Webster's College Dictionary
o′pen bar′(n.)
a bar at a reception that serves drinks paid for by the host, through an admission charge, etc.
Category: Viniculture/Winemaking
Ref: Compare cash bar.
Origin of open bar:
1970
Wiktionary
open bar(Noun)
A bar at which drinks are served without charge, usually at a social event.
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