open bar

noun
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.
Compare cash bar.


Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  open bar
Part of Speech:  n
Definition:  a social event when drinks are served for free or prepaid through the admission fee
Dictionary.com's 21st Century Lexicon
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Example sentences
Several bars around town offer open bar nights, some that include buffets.
The third in a series of monthly benefits includes an open bar and appetizers.
For three of the cruise's four hours, patrons may enjoy drinks from the open
  bar.
The company has a morning snorkel tour that is four hours long and includes
  lunch and an open bar.
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