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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 one's whistle
Rur. to take a drink. He stopped at the bar to wet his whistle. I don't need a big glass of water. Just enough to wet my whistle.
wet (one's) whistleInformal
To take a drink.
wet one's whistle, to
To have a drink. It is very difficult to whistle with dry lips. An old children’s party game involves eating some dry crackers or bread and attempting to whistle; the first to succeed in doing so wins a prize. The term has been around since the fourteenth century. It appeared in Chaucer’s Canterbury Tales: “So was her joly whistle wel y-wet” (The Reeve’s Tale).
See also: wet