To sputter or hiss.
To fail to generate the expected yield when exploded during testing.
To decay or die off to nothing; to burn out; to end less successfully than previously hoped.
Failure of an exploding nuclear bomb to meet its expected yield during testing.
An abortive effort; a flop or dud.
A state of agitation or worry.
A spluttering or hissing sound.
To expedite.
To develop.
To move, go, or proceed forward; to advance.
To improve; to become better or more complete.
Specifically, advancement to a higher or more developed state; development, growth.
Movement onwards or forwards or towards a specific objective or direction; advance.
An official journey made by a monarch or other high personage; a state journey, a circuit.
Movement or advancement through a series of events, or points in time; development through time.
Science has made extraordinary progress in the last fifty years.