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flatwise

[flat-wahyz]
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adverb
  1. with the flat side, rather than the edge, foremost or in contact.
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Also flat·ways [flat-weyz] /ˈflætˌweɪz/.

Origin of flatwise

First recorded in 1595–1605; flat1 + -wise
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for flatways

flatways

US flatwise

adverb
  1. with the flat or broad side down or in contact with another surface
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012