1(of wind etc) to subside; to die down
2to quell; to smooth over (a dispute etc)
3to suppress (a rebellion etc)
Examples
tā men他们de的chōng tū冲突zhōng yú终于píng xī平息le了。
他们的冲突终于平息了。
Finally, the discord between them came to an end.
我努力地平息他们不断加温的争执。
I tried very hard to put an end to their heated argument.
暴风雨平息下来了。
The storm has died down.