動詞 peter out:

1. end weakly
   同義詞：taper off, fizzle out, fizzle
2. use up all one's strength and energy and stop working
   同義詞：poop out, run down, run out, conk out

1. The road became narrower and rougher and eventually petered out.
   這條路越來越窄，越來越難走，最后終于消失了。
2. Seeing no future in it, his interest in the job peter out.
   因為看不出有什么前途，他對那件工作的興趣就日漸低落。