1. [n]  the act of throwing yourself down; "he landed on the bed with a great flop"
2. [n]  a complete failure; "the play was a dismal flop"
3. [n]  (informal) someone who is unsuccessful
4. [n]  an arithmetic operation performed on floating-point numbers; "this computer can perform a million flops per second"
5. [adv]  (informal) exactly; "he fell flop on his face"
6. [adv]  with a flopping sound; "he tumbled flop into the mud"
7. [v]  fall suddenly and abruptly
8. [v]  fall loosely; "He flopped into a chair"
9. [v]  fail utterly; collapse; "The project foundered"

1. \Flop\, v. t. [imp. & p. p. {Flopped}; p. pr. & vb. n.
   {Flopping}.] [A variant of flap.]
   1. To clap or strike, as a bird its wings, a fish its tail,
      etc.; to flap.
   2. To turn suddenly, as something broad and flat. [Colloq.]
      --Fielding.
   

2. \Flop\, v. i.
   1. To strike about with something broad abd flat, as a fish
      with its tail, or a bird with its wings; to rise and fall;
      as, the brim of a hat flops.
   2. To fall, sink, or throw one's self, heavily, clumsily, and
      unexpectedly on the ground. [Colloq.] --Dickens.
   

3. \Flop\, n.
   Act of flopping. [Colloq.] --W. H. Russell.
   

1. An early system on the IBM 701.

[Listed in CACM 2(5):16 (May 1959)].

2. Erroneous singular of FLOPS.