Nouns

(n)hiss, hissing, hushing, fizzle, sibilationa fricative sound (especially as an expression of disapproval)“the performers could not be heard over the hissing of the audience”
(n)flop, bust, fizzlea complete failure“the play was a dismal flop”

Verbs

(v)taper off, peter out, fizzle out, fizzleend weakly“The music just petered out — there was no proper ending”