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Definition of flop : 1. Act of flopping.
2. To clap or strike, as a bird its wings, a fish its tail, etc.; to flap.
3. To fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground.
4. 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.
5. To turn suddenly, as something broad and flat.

Synonyms:

misfire, floating-point operation, hiss, retire, wave, bummer, female chest, break, clunker, string, slump, crash, cuddle up, drop, bout, dangle, bomb, give, plunk, shake, lop, decently, mighty, hissing, loll, bunk, flutter, frost, miss, shipwreck, bump, clatter, bounce, slouch, clink, teeter, fall in, hang, thrive, clinker, hushing, beat, lay, flap, right on, clack, languish, totter, right, choke, clip-clop, flitter, decent, sag, fizzle, washout, chink, wash, hang out, bed down, hunker down, wilt, the right way, clash, plump, fall flat, fall through, wobble, sibilation, tear, fall down, suspend, correctly, tumble, droop, awareness, justly, prostration, disaster, clangor, plop, repetition, in good order, backfire, properly, founder, give way, miscarry, binge, bed, waggle, sling, catastrophe, aright, rise, powerful, cave in, down, turn in, cascade, mightily, curl up

fail, flounder, blunder, stumble, falter, collapse, bust, lose, fall, flunk

lemon, second, born loser, subordinate, turkey, second banana, inferior, reject, underdog, dud, loser, second fiddle, underachiever, has-been, subaltern, underling, failure, also-ran, nonstarter

fiasco, trouncing, breakdown, lapse, malfunction, downfall, waterloo, error, thrashing, miscarriage, noncompletion, debacle

Usage examples:

• Or, if they flop, their floppings goes in favour of more patients, and how can you rightly have one without t'other? - "A Tale of Two Cities A Story of the French Revolution", Charles Dickens.
• Paul made him feel at home at once by turning a back flip- flop off the now completed raft for his especial benefit. - "The Auto Boys' Mystery", James A. Braden.
• Their dispositions flop over like patent signals. - "Last Words", Stephen Crane.