1.  flop(n = noun.process) floating-point operation - an arithmetic operation performed on floating-point numbers; "this computer can perform a million flops per second"
is a kind of computer operation, machine operation

2.  flop(n = noun.person) dud, washout - someone who is unsuccessful;
is a kind of failure, loser, nonstarter, unsuccessful person

3.  flop(n = noun.event) bust, fizzle - a complete failure; "the play was a dismal flop"
is a kind of failure
has particulars: bomb, dud, turkey
Derived form verb flop₃

4.  flop(n = noun.act) collapse - the act of throwing yourself down; "he landed on the bed with a great flop"
is a kind of descent
Derived forms verb flop₁, adjective floppy₁

1.  flop(v = verb.motion) - fall loosely; "He flopped into a chair"
is one way to break, cave in, collapse, fall in, founder, give, give way
Derived form noun flop₄
Sample sentences: The children flop in the rocking chair; There flop some children in the rocking chair

2.  flop(v = verb.motion) - fall suddenly and abruptly;
is one way to come down, descend, fall, go down
Sample sentences: Something is ----ing PP; Somebody ----s PP

3.  flop(v = verb.social) fall flat, fall through, founder - fail utterly; collapse; "The project foundered"
is one way to fail, go wrong, miscarry
Derived form noun flop₃
Sample sentences: The business is going to flop

1.  flop(r = adv.all) - with a flopping sound; "he tumbled flop into the mud"

2.  flop(r = adv.all) right - exactly; "he fell flop on his face"

1.  To clap or strike, as a bird its wings, a fish its tail, etc.; to flap. [1913 Webster]

2.  To turn suddenly, as something broad and flat. Fielding. [1913 Webster]

1.  To strike about with something broad and flat, as a fish with its tail, or a bird with its wings; to rise and fall; as, the brim of a hat flops. [1913 Webster]

2.  To fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground. Dickens. [1913 Webster]

   Act of flopping. W. H. Russell. [1913 Webster]

flop, v., n., & adv.
--v.intr. (flopped, flopping)
1 sway about heavily or loosely (hair flopped over his face).
2 move in an ungainly way (flopped along the beach in flippers).
3 (often foll. by down, on, into) sit, kneel, lie, or fall awkwardly or suddenly (flopped down on to the bench).
4 sl. (esp. of a play, film, book, etc.) fail; collapse (flopped on Broadway).
5 sl. sleep.
6 make a dull sound as of a soft body landing, or of a flat thing slapping water.
--n.
1 a a flopping movement. b the sound made by it.
2 sl. a failure.
3 sl. esp. US a bed.
--adv. with a flop.

Idiom:
flop-house sl. esp. US a doss-house.

Etymology:
var. of FLAP

VB  be agitated, shake, tremble, tremble like an aspen leaf, quiver, quaver, quake, shiver, twitter, twire, writhe, toss, shuffle, tumble, stagger, bob, reel, sway, wag, waggle, wriggle, wriggle like an eel, dance, stumble, shamble, flounder, totter, flounce, flop, curvet, prance, cavort, squirm, throb, pulsate, beat, palpitate, go pitapat, flutter, flitter, flicker, bicker, bustle, ferment, effervesce, foam, boil, boil over, bubble up, simmer, toss about, jump about, jump like a parched pea, shake like an aspen leaf, shake to its center, shake to its foundations, be the sport of the winds and waves, reel to and fro like a drunken man, move from post to pillar and from pillar to post, drive from post to pillar and from pillar to post, keep between hawk and buzzard, agitate, shake, convulse, toss, tumble, bandy, wield, brandish, flap, flourish, whisk, jerk, hitch, jolt, jog, joggle, jostle, buffet, hustle, disturb, stir, shake up, churn, jounce, wallop, whip, vellicate.

belly flop, flip flop, fosbury flop