verb
to gradually become smaller, weaker, or less active before coming to an end
-
The project began with great enthusiasm but eventually petered out due to lack of funding.
-
I was really into that TV show, but it started to peter out in the last few seasons.
-
The party was going strong but then it just petered out and everyone went home.
-
His interest in the new hobby seemed to peter out as quickly as it began.