re: Common Sayings That Most People Have No Idea About the Origin

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Most references relate to a custom quite a few hundred years ago when drinking mugs had whistles that one would blow to indicate you needed a refill.
Some say the whistle was attached to the handle and became wet after the drink had been poured, hence to wet your whistle.
Other sources say the whistle was part of the mug, built into either the rim or handle.

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