mod. dull; lifeless. : I can't take another one of his dry-as-dust lectures.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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American Heritage
Idioms & Phrases
dry as dust
Dull, boring, as in This text is dry as dust; it's putting me to sleep. [c. 1500]
