汚い言葉を

dirty words

→ 汚い
phrase Rare #32,478
dirty words 汚い言葉 means “dirty language,” “swear words,” or “foul language”; を marks it as the object of a verb, such as 使う (to use) or 吐く (to spit out).
JA: 人前で汚い言葉を使わないでください。
EN: Please don't use foul language in public.

汚い言葉を使わない者は信用できん

You can't trust anyone who doesn't swear.

— フォーリング・ダウン (1993)

あんな汚い言葉を大丈夫か

Is it okay to use such foul language?

— フォーリング・ダウン (1993)

彼女の汚い言葉を聞くために

To hear her filthy words.

— 甘い生活 (1960)