an arch having a more or less flat intrados and extrados with voussoirs radiating from a center below the arch.
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- flat as a pancake,
- flat back,
- flat bond,
- flat bone,
- flat broke
Origin of flat arch
First recorded in 1705–15
Also called jack arch.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019