What is the meaning of fizzle?

noun

• A fricative sound (especially as an expression of disapproval. )
  • usage: "the performers could not be heard over the hissing of the audience"
  • synonyms: hiss, hissing, hushing, sibilation
• A complete failure.
  • usage: "the play was a dismal flop"
  • synonyms: flop, bust

verb

• End weakly.
  • usage: "The music just petered out-there was no proper ending"
  • synonyms: taper off, peter out, fizzle out