flatten

[ flat-n ]
/ ˈflæt n /
|

verb (used with object)

to make flat.
to knock down: The boxer flattened his opponent in the second round.

verb (used without object)

to become flat.

Verb Phrases

flatten in, Nautical. flat1(def 61).
flatten out, Aeronautics. to fly into a horizontal position, as after a dive.

Origin of flatten

First recorded in 1620–30; flat1 + -en1
SYNONYMS FOR flatten
Related formsflat·ten·er, nouno·ver·flat·ten, verb (used with object)un·flat·tened, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for flattener

flatten

/ (ˈflætən) /

verb

(sometimes foll by out) to make or become flat or flatter
(tr) informal
  1. to knock down or injure; prostrate
  2. to crush or subduefailure will flatten his self-esteem
(tr) music to lower the pitch of (a note) by one chromatic semitoneUsual US word: flat
(intr foll by out) to manoeuvre an aircraft into horizontal flight, esp after a dive
Derived Formsflattener, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for flattener

flatten


v.

late 14c., "to prostrate oneself," also "to fall flat," from flat (adj.) + -en (1). Meaning "to make flat" is 1620s. Related: Flattened; flattening.

Online Etymology Dictionary, © 2010 Douglas Harper