To flop is to drop or hang heavily and loosely. If you're exhausted at the end of the day, you might flop into a chair as soon as you walk into your house.

Your long hair might flop into your eyes, and if you catch a fish, you'll have to watch it flop around in your boat before it stops breathing. A tired child might begin to sob and flop onto the floor in frustration. You can also call a disaster a flop: "We worked so hard on that play, but it turned out to be a total flop." The earliest meaning of flop was "to flap."

Definitions of flop
  1. verb
    fall loosely
    “He flopped into a chair”
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    type of:
    break, cave in, collapse, fall in, founder, give, give way
    break down, literally or metaphorically
  2. verb
    fall suddenly and abruptly
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    type of:
    come down, descend, fall, go down
    move downward and lower, but not necessarily all the way
  3. noun
    the act of throwing yourself down
    “he landed on the bed with a great flop
    synonyms: collapse
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    type of:
    the act of changing your location in a downward direction
  4. adverb
    with a flopping sound
    “he tumbled flop into the mud”
  5. adverb
    “he fell flop on his face”
    synonyms: right
  6. verb
    fail utterly; collapse
    synonyms: fall flat, fall through, founder
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    type of:
    fail, go wrong, miscarry
    be unsuccessful
  7. noun
    a complete failure
    “the play was a dismal flop
    synonyms: bust, fizzle
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    bomb, dud, turkey
    an event that fails badly or is totally ineffectual
    type of:
    an event that does not accomplish its intended purpose
  8. noun
    someone who is unsuccessful
    synonyms: dud, washout
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    type of:
    failure, loser, nonstarter, unsuccessful person
    a person with a record of failing; someone who loses consistently
  9. noun
    an arithmetic operation performed on floating-point numbers
    “this computer can perform a million flops per second”
    synonyms: floating-point operation
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    type of:
    computer operation, machine operation
    an elementary operation that a computer is designed and built to perform
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