flattened; flattening ˈflat-niŋ How to pronounce flatten (audio)
ˈfla-tə-
Synonyms of flattennext

transitive verb

: to make flat
flatten the dough into a disk
The dog flattened its ears.
: such as
a
: to make level or smooth
flattened the papers
b
: to knock down
houses flattened by the tornado
also : to defeat decisively
got flattened in the first round of playoffs
c
: to make dull or uninspired
… small changes … that flatten a writer's style …John Gross
often used with out
In thus flattening out a complicated story, the book misses an opportunity …Tony Judt
d
: to make lusterless
flatten paint
e
: to stabilize especially at a lower level
a candidate promising to flatten interest rates

intransitive verb

: to become flat or flatter: such as
a
: to become dull or spiritless
b
: to extend in or into a flat position or form
c
: to become uniform or stabilized often at a new lower level
usually used with out
prices flattening out

flattener

2 of 2

noun

plural -s
: one that flattens: such as
a
: a worker who flattens materials (as metal, leather, paper, or glass)
b
: a machine for flattening or straightening plates or sheets

Synonyms of flatten

Examples of flatten in a Sentence

Verb Dozens of houses were flattened by the tornado. The boxer was flattened in the seventh round. The team got flattened in the first round of the play-offs. Prices are expected to flatten after the holiday shopping season.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Verb
Use your finger to flatten the surface and brush away any excess chalk dust. Emily Benda Gaylord, The Spruce, 5 July 2026 Big earthquakes flatten buildings into rubble the same way everywhere. Gisela Salim-Peyer, The Atlantic, 1 July 2026 These sprawling facilities devour an enormous amount of power, require heaps of water to keep cool, and generate tons of noise, on top of being an eyesore that requires hundreds of acres of land be flattened. Frank Landymore, Futurism, 2 July 2026 Entire neighborhoods in areas such as La Guaira and Caracas have been flattened, with more than hundreds of buildings damaged or destroyed in preliminary satellite assessments. Verónica Egui Brito july 1, Miami Herald, 1 July 2026 See All Example Sentences for flatten

Word History

First Known Use

Verb

1630, in the meaning defined at transitive sense

Time Traveler
The first known use of flatten was in 1630

Cite this Entry

“Flatten.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flatten. Accessed 7 Jul. 2026.

Kids Definition

flattened; flattening ˈflat-niŋ How to pronounce flatten (audio)
-ᵊn-iŋ
: to make or become flat

More from Merriam-Webster on flatten

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!