Peter的解释
彼得(人名)
v.慢慢消失，耗尽
Peter的例句
His interest in learning Japanese has petered out.
他学习日语的兴趣逐渐消失了。

The road became narrower and rougher and eventually petered out.
这条路越来越窄，越来越难走，最后终于消失了。