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

Examples of flatten in a Sentence

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.
Since the early 2010s, spending per Medicare beneficiary had largely flattened. — Aric Coffman, Forbes.com, 23 Sep. 2026 In Lois Lowry’s dystopian novel The Giver, a world of human complexity has been flattened deliberately to remove the inconvenient excesses of emotion and feeling. — Literary Hub, 22 Sep. 2026 Unlike a tornado, microburst damage looks flattened out, with trees pointing in the same direction or fanning out from one another. — Chad Murphy, Cincinnati Enquirer, 21 Sep. 2026 What stayed with him was not just the gravity of their circumstances, but their refusal to be flattened by it. — Riann Phillip, Vogue, 18 Sep. 2026 See All Example Sentences for flatten

Word History

First Known Use

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 29 Sep. 2026.

Kids Definition

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