Jisho

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Godan verb with 'su' ending, Transitive verb
1. to pollute; to contaminate; to soil; to make dirty; to stain​
  • その
  • ほん本
  • を
  • よご汚さない
  • ように
  • あつか扱って
  • くれる
  • なら
  • 、
  • か貸してあげる
  • よ
  • 。
You may borrow this book as long as you keep it clean.
Godan verb with 'su' ending, Transitive verb
2. to disgrace; to dishonour; to dishonor; to defile​esp. けがす
  • あんな
  • こうどう行動
  • は
  • かれ彼
  • の
  • たいめん体面
  • を
  • よご汚す
  • もの
  • だ
  • 。
Such behavior is beneath his dignity.
Other forms
汚す 【けがす】、穢す 【けがす】

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