What do a.m. and p.m. stand for?

flat back

a book spine presenting a completely flat surface.
a book bound with such a spine.
Origin of flat back
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for flat back
  • They shall be furnished with two nuts to facilitate installation and alignment of the flat back gate.
  • The single-bitted axe also offers a flat back area for light hammering chores, such as driving tent stakes.
  • The books will stack on top of each other, and water will flow up the flat back of the books due to their streamlined shapes.

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