turn one's back on somebody是什么意思呢？

不理睬他人 ！！！ 解释就是把背对着别人（很形象）
人体部位和英语习语

1. Head

two heads are better than one (三个臭皮匠顶个诸葛亮).

2. Eye

Mind your eye (当心)!

3. Ear

A piece of light music is easy on the ear. (悦耳动听).

If you have some juicy gossips, I’m all ears(专心聆听).

Walls have ears (隔墙有耳)

4. Nose

Lead somebody by the nose (牵着某人的鼻子走)

Turn up one's nose at somebody or something (对某人或某物嗤之一鼻）.

as plain as the nose in one's face (一清二楚)

5. Lip

don't open your lips (不要开口)

lips are sealed （保密）

escaped someone's lips (脱口而出)

is on everybody's lips (众口相传).

6. Tongue

hold one's tongue (保持沉默)

A person who has too much tongue (太多嘴)

Don't you have a mouth below your nose (你鼻子底下不是有张嘴吗)?

7. Face

lose face (丢面子)

save face (挽回面子)

pull a lon