flattens out

flatten

[flat-n]
verb (used with object)
1.
to make flat.
2.
to knock down: The boxer flattened his opponent in the second round.
verb (used without object)
3.
to become flat.
Verb phrases
4.
flatten in, Nautical, flat1 ( def 61 ).
5.
flatten out, Aeronautics. to fly into a horizontal position, as after a dive.

Origin:
1620–30; flat1 + -en1

flattener, noun
overflatten, verb (used with object)
unflattened, adjective


2. ground, fell, prostrate, deck, floor.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flatten (ˈflætən)
 
vb (foll by out)
1.  (sometimes foll by out) to make or become flat or flatter
2.  informal (tr)
 a.  to knock down or injure; prostrate
 b.  to crush or subdue: failure will flatten his self-esteem
3.  (tr) music Usual US word: flat to lower the pitch of (a note) by one chromatic semitone
4.  to manoeuvre an aircraft into horizontal flight, esp after a dive
 
'flattener
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

flatten
late 14c., "to prostrate oneself," also "to fall flat," from flat + -en (1). Meaning "to make flat" is early 17c. Related: Flattened; flattening.
Online Etymology Dictionary, © 2010 Douglas Harper
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