a book spine presenting a completely flat surface.
a book bound with such a spine.
bounce backRead more in this article about some frequently asked questions and fun facts related to our definitions.
back dimplesRead more in this article about some frequently asked questions and fun facts related to our definitions.
disabled, ill, infirm, decumbent, flat, horizontal, level, procumbent, prone, prostrate, recumbent, ailing, incapacitated, invalid, parallel, supine
- flat arch,
- flat as a pancake,
- flat bond,
- flat bone,
- flat broke,
- flat bug,
- flat cap
Origin of flat back
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019