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 through gossip.
わるぐち
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.
あの人、人の悪口ばっかり言うから苦手なんだよね。
I'm not fond of that person because they're always badmouthing others.
それって、悪口じゃなくない？
It's not considered speaking ill of someone, is it?
みんなが私の悪口を言っているのを聞いちゃったんだよね。
I overheard everyone talking behind my back.