fiz·zle / ˈfizəl/ • v. [intr.] end or fail in a weak or disappointing way: their threatened revolt fizzled out at yesterday's meeting. ∎ make a feeble hissing or spluttering sound: the strobe lights fizzled and flickered.• n. a failure: in the end the fireworks were a fizzle. ∎ a feeble hissing or spluttering sound: the electric fizzle of the waves.