disparage (けなす): It’s not polite to disparage others behind their backs. (他人を陰でけなすのは礼儀に反します) - 試験に出る! 英単語検索辞書

disparage (けなす): It’s not polite to disparage others behind their backs. (他人を陰でけなすのは礼儀に反します)

It’s not polite to disparage others behind their backs.