To make a sharp sibilant sound
To lose strength or power.
Even this plan began to fizzle when she returned home a few hours later.
A sleepover isn't over until the guests depart, but unfortunately many parties fizzle after the sun comes up.
When they begin to fizzle, the conclusion is there was not chemistry.
When jumpsuits broke onto the fashion scene in the spring, some people thought they were nothing more than a flash in the pan that would fizzle out before they caught on.
They cited the fact that they were obligated to remain apart during the four months between the show's wrap and final airing caused the romance to fizzle.