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An alcoholic beverage consumed just before an event, typically to ease anxiety or boredom and to make that event just about tolerable.
Tom: Hey are you going to the office Christmas Party? New boss says we have to.
Dave: Ah shit. Better get on the impéritifs then!

Andy: There's no way I'm volunteering at the old people's home sober.
Rick: Agreed. Fancy an impéritif or three?
by ChasEdwards June 21, 2014