from The American Heritage® Dictionary of the English Language, 4th Edition

  • intransitive v. To fall or lie down heavily and noisily.
  • intransitive v. To move about loosely or limply: The dog's ears flopped when it ran.
  • intransitive v. Informal To fail utterly: The play flopped.
  • intransitive v. Slang To rest idly; lounge.
  • intransitive v. Slang To go to bed.
  • transitive v. To drop or lay (something) down heavily and noisily: flopped the steak onto a platter.
  • n. The act of flopping.
  • n. The sound made when flopping.
  • n. Informal An utter failure.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To fall heavily, because lacking energy.
  • v. To fail completely, not to be successful at all (about a movie, play, book, song etc.).
  • v. To pretend to be fouled in sports, such as basketball, hockey (the same as to dive in soccer)
  • n. An incident of a certain type of fall; a plopping down.
  • n. A complete failure, especially in the entertainment industry.
  • n. The first three cards turned face-up by the dealer in a community card poker game.
  • n. A place to stay, sleep or live. See flophouse
  • n. A ponded package of dung, as in a cow-flop.
  • adv. Right, squarely, flat-out.
  • adv. With a flopping sound.
  • n. A unit of measure of processor speed, being one floating-point operation per second.

from the GNU version of the Collaborative International Dictionary of English

  • n. Act of flopping.
  • intransitive v. To strike about with something broad and flat, as a fish with its tail, or a bird with its wings; to rise and fall.
  • intransitive v. To fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground.
  • transitive v. To clap or strike, as a bird its wings, a fish its tail, etc.; to flap.
  • transitive v. To turn suddenly, as something broad and flat.

from The Century Dictionary and Cyclopedia

  • To clap or strike, as the wings; flap.
  • To cause to fall or hang down.
  • To flap.
  • To plump down suddenly; turn or come down with a flop: as, to flop on one's knees.
  • To collapse; yield or break down suddenly.
  • To go over suddenly to another side or party; make a sudden change of association or allegiance.
  • n. The act of flopping or flapping.
  • n. A fall like that of a soft outspread body upon the ground.
  • n. Something that flops or is capable of flopping or striking, as a fluid, semi-liquid, or gelatinous substance, against the side of a vessel containing it.
  • n. A sudden collapse or breakdown, as of resistance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a complete failure
  • adv. with a flopping sound
  • n. an arithmetic operation performed on floating-point numbers
  • n. the act of throwing yourself down
  • v. fall suddenly and abruptly
  • v. fall loosely
  • n. someone who is unsuccessful
  • v. fail utterly; collapse
  • adv. exactly


from The American Heritage® Dictionary of the English Language, 4th Edition

Alteration of flap.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Recorded since 1602, probably a variant of flap with a duller, heavier sound

from Wiktionary, Creative Commons Attribution/Share-Alike License

Syllabic abbreviation of floating point + operation.



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  • Whether stooping to remove a pile of horse flop or sauntering off to his swank hotel, his hat had to be just so.

    —Toni Morrison, Jazz

    Not in OED in this precise sense, but it does have: 3. dial. A mass of thin mud. Also transf.

    December 30, 2008