What is the meaning of flop?

noun

• An arithmetic operation performed on floating-point numbers.
  • usage: "this computer can perform a million flops per second"
  • synonyms: floating-point operation
• Someone who is unsuccessful.
  • synonyms: dud, washout
• A complete failure.
  • usage: "the play was a dismal flop"
  • synonyms: bust, fizzle
• The act of throwing yourself down.
  • usage: "he landed on the bed with a great flop"
  • synonyms: collapse

verb

• Fall loosely.
  • usage: "He flopped into a chair"
• Fall suddenly and abruptly.
• Fail utterly; collapse.
  • usage: "The project foundered"
  • synonyms: fall through, fall flat, founder

adverb

• With a flopping sound.
  • usage: "he tumbled flop into the mud"
• Exactly.
  • usage: "he fell flop on his face"
  • synonyms: right