- flat as a pancake
- *flat as a board & *flat as a pancakeCliché very flat. (Also used to describe someone's chest or abdomen, referring to well-developed abdominal muscles or small or nearly absent breasts or pectoral muscles—in either sex. *Also: as \flat as a pancake.) •
Jane was flat as a board until she was sixteen, when she suddenly blossomed.
•Lucy can mash an aluminum can flat as a pancake with one blow from her heel.
* * *{adj. phr.} Very level; very flat; having no mountains or hills. * /A great part of the American Midwest is as flat as a pancake./
Dictionary of American idioms. 2013.