Dictionary / Vocabulary / 猛威を振るう
もういをふるう
to rage (of a storm, flu, etc.); to be on a rampage; to be rampant; to wreak havoc
Also written 猛威をふるう、猛威を奮う、猛威を振う、猛威を揮う
ヨットは猛威を振るう嵐の中に翻弄された。
The yacht was at the mercy of the dreadful storm.