此起彼伏 cǐ​qǐ​bǐ​fú
recur idiom
to occur repeatedly or break out one after another, especially regarding social phenomena, protests, or conflicts

During that period, strikes broke out one after another in various places.

undulate idiom
to rise and fall in succession, typically describing sounds, waves, or physical terrain

In the concert hall, rounds of warm applause rose and fell.

Frequency

Written text
0.089 per million

Sources

Frequency data
BCC Corpus (BLCU)