悪口 (わるぐち, waruguchi) Japanese meaning: abuse | Kotomoraいる
。
He is always bad-mouthing people.
It's not good to speak ill of others behind their backs.
Usage patterns
〈人〉の悪口を言うto speak ill of someone
He often bad-mouths his coworkers.
悪口を叩くto bad-mouth someone (casual, spoken)
Everyone was bad-mouthing her.
悪口を聞くto hear someone bad-mouthing (someone)
I felt sad when I heard people talking bad about me.