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open bar

noun
1.
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 of open bar
1970-1975
First recorded in 1970-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Contemporary definitions for open bar
noun

something or someone that is easily understandable; something that is very clear; someone who conceals nothing

Examples

Her life is an open book.

Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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6
8
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