Dictionary.com

flat as a pancake

Extremely level, especially too much so. For example, There are no hills; this terrain is flat as a pancake. This simile dates from the 1500s and has survived its contemporary, flat as a flounder. It is sometimes used, either disparagingly or ruefully, to describe a small-breasted woman.

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A bet is synonymous with a wager, but what does it mean in New York?
Often it means something is impossible.
It’s another way to agree with someone.
It serves as an apology.
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Words nearby flat as a pancake

flashy, flask, flasket, flat, flat arch, flat as a pancake, flat back, flatbed, flat-bed lorry, flat-bed plotter, flat-bed press
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.