open up

To spread out; unfold

展开；摊开

A green valley opened up before us.

青翠的山谷展现在我们眼前

To begin operation

开战；开火

The new store opens up next month.

这家新商店将在下个月开张

The artillery opened up at dawn.

炮兵于拂晓时开口

&I{Informal} To speak freely and candidly

【非正式用语】 直言不讳

At last the frightened witness opened up and told the truth.

这名吓坏了的目击者终于直言不讳说出了事实

To make an opening in by cutting

切开

The surgeon opened up the patient's chest.

这名外科医生切开了病人的胸部

To make available or accessible

使可利用；使通往

open up new markets.

打开了新的市场

&I{Informal} To accelerate. Used of a motor vehicle.

【非正式用语】 （用于汽车）加速

be open with

speak frankly to; conceal nothing from

坦率直言

I had always been completely open with my mother.

我一直在妈妈面前知无不言。

in (或 into) the open

out of doors; not under cover

户外

in open court

in a court of law, before the judge and the public

在法庭上（面对法官和群众）

open-and-shut

(of a case or argument) admitting no doubt or dispute; straightforward

（案件或争论）一目了然的

open the batting

(Cricket)play as one of the pair of batsmen who begin a side's innings

(板球)开球

open the door to

open someone's eyes

an open mind

with one's eyes open (或with open eyes)

fully aware of the risks and other implications of an action or situation

睁大眼睛（充分认识到风险）

I went into the job with my eyes open—everyone knows what happens to an unsuccessful manager.

我睁大眼睛开始了工作——每个人都知道失败的经理会有什么下场。

with open arms

I went into the job with my eyes open—everyone knows what happens to an unsuccessful manager.

我睁大眼睛开始了工作——每个人都知道失败的经理会有什么下场。

open something up

accelerate a motor vehicle

加速（机车）

(of a sports player or team) create an advantage for one's side

（运动员，运动队）取得本方的领先

he opened up a lead of 14–8.

他开了个好头，以14比8领先。

open fire

To begin firing on.

开火

open (one's) eyes

To become aware of the truth of a situation.

使看清事实真相