FLAT AS A BOARD

flat as a board: translation

*flat as a board & *flat as a pancake

Cliché 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 board.) •

Jane was flat as a board until she was sixteen, when she suddenly blossomed.

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Lucy can mash an aluminum can flat as a pancake with one blow from her heel.