n. liquor; a drink of liquor. : I could use a shot of that mouthwash.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: mouth·wash Pronunciation: 'mauth-"wosh, -"wäsh Function: noun : a liquid preparation (as an antiseptic solution) for cleansing themouth and teeth called also collutorium