fizzle

1. (figuratively, informal) To decay or die off to nothing; to burn out; to end less successfully than previously hoped.Examples: "The entire project fizzled after the founder quit."; "And so it fizzled to its close with Gary Cahill galloping around as an extra centre-forward, mutinous chants of “you’re not fit to wear the shirt,” from the England followers and Hodgson’s media staff announcing he would not take any questions."

2. (military, of a nuclear weapon) To fail to generate the expected yield when exploded during testing.Examples: "The shot fizzled, generating only 200 tons rather than the 30 kilotons they were aiming for."