wet your whistle
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wet (one's) whistle
To have something to drink. I'm parched. I'm going to need to wet my whistle before we go on. If you're looking for Barney, he's down at the pub wetting his whistle.
wet your whistleOLD-FASHIONED, INFORMAL
If you wet your whistle, you have a drink, especially an alcoholic drink. There's a mouth-watering menu and an excellent selection of beers to wet your whistle. Note: `Whistle' is an old slang word for mouth or throat.