Bad-Mouthing
Trash-Talk
noun
Your bad mouth produces nothing but bad-mouthing and trash-talk.
悪口 often targets someone's character, appearance, or abilities, with the intention of hurting them or damaging their reputation, sometimes to their face, but often behind their back. It gives rise to unfavorable information that can spread though gossip.
The reading is the kun'yomi vocab readings for these two kanji, probably because this word is just two words put together into one (bad + mouth). Use your knowledge of the vocab words 悪い and 口 to learn the reading of this word.
Okay, I lied. You should actually do わるぐち instead. わるくち is possible, but the rendaku version is way more common. Sorry to say such bad things before.
悪口を言いふらす
to spread bad rumors
悪口を言う
to bad-mouth someone
悪口を言い合う
to bad-mouth one another
ビエトは意地悪なえみをうかべながらコウイチに大声で悪口を言い始めた。
Viet started shouting verbal abuse at Koichi with a malicious grin.
子どもの前では、おっとの悪口を言ったことがありません。
I've never bad mouthed my husband in front of my kids.
友達がみんなで私の悪口を言っているのを聞いちゃったんだよね。
I heard that all of my friends were saying bad things about me.