Jisho

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もう 猛威
Expressions (phrases, clauses, etc.), Godan verb with 'u' ending
1. to rage (of a storm, flu, etc.); to be on a rampage; to be rampant; to wreak havoc
Other forms
猛威をふるう 【もういをふるう】猛威を奮う 【もういをふるう】
Notes
猛威を奮う: Irregular kanji usage.

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