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Origin: An earlier form of this English expression was dull as ditchwater,' meaning the muddy water of a ditch. Ditchwater is cloudy and definitely not exciting. So is dishwater. The change in words probably occcurred as a mispronunciation or a mistake in printing. Very Very dull.

The dirty water you get after washing dishes is not very interesting, after all. ---- Book where info was found: Dictionary of IDIOMS More than 600 phrases sayings and expression.

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16y ago

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