qǐ​fú HSK7

undulate

起伏 qǐ​fú
undulate verb
to move up and down or rise and fall like waves, whether physically or visually

As the breeze blew, the golden wheat fields undulated.

fluctuations verb
variations or ups and downs in intensity, emotion, or life circumstances

With the moving melody, the listeners' emotions rose and fell.

Frequency

Movie subtitles
3.58 per million appears in 2% of films
Written text
9.18 per million

Details

HSK 2.0
Level 6
HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT