flatten

verb
flat·​ten | \ ˈfla-tᵊn \
flattened; flattening\ ˈflat-​niŋ , ˈfla-​tə-​ \

Definition of flatten 

transitive verb

: to make flat: such as
a : to make level or smooth
b : to knock down also : to defeat decisively
c : to make dull or uninspired often used with out
d : to make lusterless flatten paint
e : to stabilize especially at a lower level

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

Keep scrolling for more

Other Words from flatten

flattener \ ˈflat-​nər , ˈfla-​tə-​ \ noun

Synonyms & Antonyms for flatten

Synonyms

even, level, plane, smooth, smoothen

Antonyms

rough, roughen

Visit the Thesaurus for More 

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.
See More

Recent Examples on the Web

Sales by value are beginning to stagnate and property investment is flattening. WSJ, "Chinese Consumers Curb Spending, Likely Deepening Slowdown," 3 Jan. 2019 The gulf-side town of Mexico Beach, Florida, was all but flattened from the onslaught. Umair Irfan, Vox, "What we learned from the disasters that hammered the US in 2018," 27 Dec. 2018 When Thomas was later confirmed to the Supreme Court, the countless women who’d watched Hill—and maybe Hill herself—were demoralized, flattened even. Celeste Ng, Glamour, "Celeste Ng Reflects on Our Era of Rage—and Illuminates the Path Forward.," 21 Dec. 2018 But be careful not to pull too hard—that’ll just flatten everything out. 7. Amy Marturana, SELF, "17 Styling Tricks Women with Fine, Flat Hair Need to Know," 21 Dec. 2018 The cutting and flattening tears out fibers and leaves divots, leading to plenty of sanding—some by machine and much by hand. Tim Newcomb, Popular Mechanics, "The Man, the Wood, and the River," 1 Dec. 2018 Her Lisbeth exhibits little in the way of personality beyond a dour demeanor and flattened line deliveries. Soren Andersen, The Seattle Times, "‘The Girl in the Spider’s Web’: Lisbeth Salander gets trapped in a conventional spy thriller," 6 Nov. 2018 Repeat the process until all of the butter cubes have been flattened. Michaela Bechler, Vogue, "Be Ambitious This Thanksgiving: 3 Bold Recipes From One of L.A.’s Most Talked About Restaurants," 2 Nov. 2018 In Mosul's old city, a mess of flattened concrete and twisted wire, the prospect of rebuilding is daunting. Sophia Jones, Marie Claire, "The Truth About The Wives of ISIS," 4 Oct. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'flatten.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of flatten

1630, in the meaning defined at transitive sense

Keep scrolling for more

Learn More about flatten

Statistics for flatten

Last Updated

10 Jan 2019

Look-up Popularity

Time Traveler for flatten

The first known use of flatten was in 1630

See more words from the same year

Keep scrolling for more

More Definitions for flatten

flatten

verb

English Language Learners Definition of flatten

: to make (something) flat or flatter

: to become flat or flatter

: to knock down (something or someone)

flatten

verb
flat·​ten | \ ˈfla-tən \
flattened; flattening

Kids Definition of flatten

: to make or become flat She flattened herself against the wall.

Keep scrolling for more

More from Merriam-Webster on flatten

Rhyming Dictionary: Words that rhyme with flatten

Thesaurus: All synonyms and antonyms for flatten

Spanish Central: Translation of flatten

Nglish: Translation of flatten for Spanish Speakers

Britannica English: Translation of flatten for Arabic Speakers

Comments on flatten

What made you want to look up flatten? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a person who helps groups work together

Get Word of the Day daily email!

Test Your Vocabulary

Liar, Liar Quiz

  • alt-5761dbe2ba986
  • Someone who pretends to be sick in order to avoid work is a:
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

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