猛もう威いを振ふるう

expression, godan verb (-u)

rage; be rampant; wreak havoc

Used for destructive forces such as storms, epidemics, or violence spreading uncontrollably. Often appears in news reports.

• 台たい風ふうが猛もう威いを振ふるい、多おおくの家いえが倒とう壊かいした。

  The typhoon raged, causing many houses to collapse.

• 新しん型がたインフルエンザが世せ界かい中じゅうで猛もう威いを振ふるっている。

  The new strain of influenza is rampant worldwide.