- dry as a bone
- *dry as dust & *dry as a bone1. Cliché very dry. (*Also: as \dry as a bone.) •
The bread is as dry as dust.
•When the leaves are dry as a bone, they break into powder easily.
2. Cliché very dull; very boring. (*Also: as \dry as a bone.) •This book is as dry as dust. I am going to stop reading it.
•Her lecture was dry as dust—just like her subject.
Dictionary of American idioms. 2013.