open up

To spread out; unfold

展開；攤開

A green valley opened up before us.

青翠的山谷展現在我們眼前

To begin operation

開戰；開火

The new store opens up next month.

這家新商店將在下個月開張

The artillery opened up at dawn.

炮兵于拂曉時開口

&I{Informal} To speak freely and candidly

【非正式用語】 直言不諱

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

這名嚇壞了的目擊者終于直言不諱說出了事實

To make an opening in by cutting

切開

The surgeon opened up the patient's chest.

這名外科醫生切開了病人的胸部

To make available or accessible

使可利用；使通往

open up new markets.

打開了新的市場

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

【非正式用語】 （用于汽車）加速

be open with

speak frankly to; conceal nothing from

坦率直言

I had always been completely open with my mother.

我一直在媽媽面前知無不言。

in (或 into) the open

out of doors; not under cover

戶外

in open court

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

在法庭上（面對法官和群眾）

open-and-shut

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

（案件或爭論）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)開球

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

睜大眼睛（充分認識到風險）

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

我睜大眼睛開始了工作——每個人都知道失敗的經理會有什么下場。

with open arms

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

我睜大眼睛開始了工作——每個人都知道失敗的經理會有什么下場。

open something up

accelerate a motor vehicle

加速（機車）

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

（運動員，運動隊）取得本方的領先

he opened up a lead of 14–8.

他開了個好頭，以14比8領先。

open fire

To begin firing on.

開火

open (one's) eyes

To become aware of the truth of a situation.

使看清事實真相