In or into a flat position; with the broad or wide side forward or facing up.
Variant of 'flatway' with the addition of 's' for emphasis or formalization, used in technical and nautical language.
If you lay a wooden board 'flatways' you're putting it wide-side up; if you stand it 'edgewise' you're balancing it on its thin side—two different ways to position the exact same object.
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