verb (used without object), flopped, flopping.
to fall or plump down suddenly, especially with noise; drop or turn with a sudden bump or thud (sometimes followed by down ): The puppy flopped down on the couch.
to change suddenly, as from one side or party to another (often followed by over ).
to be a complete failure; fail: The play flopped dismally.
Informal. to sleep or be lodged: to flop at a friend's house.
to swing loosely; bounce; flap: His long hair flops in his eyes when he runs.
verb (used with object), flopped, flopping.
to drop with a sudden bump or thud: He flopped his books on a chair.
to dispose (oneself) in a heavily negligent manner: to flop oneself in a chair.
to invert (the negative of a photograph) so that the right and left sides are transposed.
an act of flopping.
the sound of flopping; a thud.
a failure: The new comedy was a flop.
Informal. a place to sleep; temporary lodging: The mission offered a flop and a free breakfast.

1595–1605; 1890–95 for def 11; variant of flap

flopper, noun

11. fiasco, disaster, debacle; bomb, dog.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flop (flɒp)
vb (when intr, often foll by into, onto, etc) (often foll by out) , flops, flopping, flopped
1.  (intr) to bend, fall, or collapse loosely or carelessly: his head flopped backwards
2.  to fall, cause to fall, or move with a sudden noise: the books flopped onto the floor
3.  informal (intr) to fail; be unsuccessful: the scheme flopped
4.  (intr) to fall flat onto the surface of water, hitting it with the front of the body
5.  slang to go to sleep
6.  the act of flopping
7.  informal a complete failure
8.  slang (US), (Canadian) a place to sleep
9.  athletics See Fosbury flop
10.  poker the flop the first three community cards dealt face-up in a round of any of several varieties of poker, including Texas hold 'em
[C17: variant of flap]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, probably a variant of flap with a duller, heavier sound. Sense of "fall or drop heavily" is 1836, that of "collapse, fail" is 1919; though the figurative noun sense of "a failure" is recorded from 1893. The noun in the literal sense is from 1823.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
floating-point operation
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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