fizzle out phrasal verb informal (see also fizzle)
to gradually stop happening, especially because people become less interested:
Their romance just fizzled out.

[TahlilGaran] Dictionary of Contemporary English ▲

fizzle out
to end in a disappointing way.
I dated him a for a while, but our so-called romance fizzled out rather quickly.

[TahlilGaran] English Idioms Dictionary ▲

fizzle out
to fail after a good start, to end in failure
The party began to fizzle out at midnight when many people went home.

[TahlilGaran] English Idioms Dictionary ▲

fizzle out
v., informal
1. To stop burning; die out.
The fuse fizzled out before exploding the firecracker.
2. To fail after a good start; end in failure.
The power mower worked fine for a while but then it fizzled out.
The party fizzled out when everyone went home early.

[TahlilGaran] English Idioms Dictionary ▲