back

at someone's back

in pursuit or support someone

追求；支持（某人）

back and forth

to and fro

来回地

back in the day

in the past; some time ago

在过去，在以前

back in the day, he'd had one of the greatest minds I'd ever come across.

从前他曾是我所遇到过的最有头脑的人之一。

someone's back is turned

someone's attention is elsewhere

某人的注意力在别处

he kissed her quickly, when the landlady's back was turned.

趁女房东注意别的地方的时候，他很快地吻了她一下。

the back of beyond

a very remote or inaccessible place

偏僻处

back o'Bourke

(Austral. informal)the outback

(澳，非正式)内地

the back of one's mind

used to express that something is in one's mind but is not consciously thought of or remembered

下意识里

she had a little nagging worry at the back her mind.

下意识里她还存有顾虑。

back to front

(Brit.)with the back at the front and the front at the back

(英)前后颠倒

the exhausts had been fitted back to front.

排气管前后装倒了。

a back-to-front baseball cap.

前后颠倒的棒球帽。

back water

reverse the action of the oars, causing a boat to slow down or stop

倒桨

back the wrong horse

make a wrong or inappropriate choice

下错了赌注；做错了选择

behind someone's back

without a person's knowledge and in an unfair or dishonourable way

在某人背后，背着某人

Carla made fun of him behind his back.

卡拉在他背后取笑他。

get (或 put) someone's back up

make someone annoyed or angry

惹恼（或惹怒）某人

in back

(N. Amer.)at the back of something, especially a building

(北美)在后面（尤指建筑）

dad demolished an old shed in back of his barn.

父亲拆掉了仓库后面的一个旧棚。

know something like the back of one's hand

be entirely familiar with a place or route

（对地方或路线）了如指掌