a quick one
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A brief stop or break to have an alcoholic beverage. Let's stop by the bar for a quick one before we go home. I'm not looking to stay at the bar all night. Let's just grab a quick one before we go to the game.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a ˈquick one(British English, informal) a drink, usually alcoholic, which you have a short time for before doing something else: Have you got time for a quick one before your train goes?
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