Backless describes clothes — a dress, a top, a gown, a swimsuit — that leave a woman’s back open. The cloth does not cover the back, or covers only a strip or a little of it, so you see skin from the shoulders down. It is about the cut of the garment, not about a person having no back.

Backless「backless」 describes形容的是 clothes衣服——a dress, a top, a gown, a swimsuit洋裝、上衣、禮服、泳衣——that它們 leave開著 a woman's back一個女人的背 open讓它露出來。The cloth布料 does not cover沒有蓋住 the back背部，or或 covers only只蓋住 a strip or a little of it一小條或一點點，so所以 you你 see skin就會看到皮膚 from the shoulders down從肩膀以下。It它 是關乎的是 about the cut of the garment衣服的剪裁，not about而不是 a person有沒有背 having no back。

You almost always hear it stuck to a clothing word: a backless dress, a backless swimsuit. It is ordinary fashion talk.

You你 almost always hear it幾乎都會看到它 stuck to黏著 a clothing word一個衣服相關的字：a backless dress露背洋裝、a backless swimsuit露背泳衣。It它 是 ordinary fashion talk一般的時尚用語。

It is not a rude word by itself; how much back is shown, and whether that fits the event, is a separate, social question. You will not normally use it for chairs or buildings — those have other words.

It它 is not本身不是 a rude word一個粗俗的字 by itself它本身；how much back露出多少背 is shown、and而 whether是否 that fits the event符合場合，是 a separate, social question另一個社交層面的問題。You你 will not normally use it通常不會用它 for chairs or buildings來形容椅子或建築——those那些東西 have有 other words其他的字可以用。