act out

To perform in or as if in a play; dramatize

在行动中实现，付诸行动

act out a story.

连说带比划地讲将故事

wanted to act out his theory.

想在行动中实践他的理论

To express (unconscious impulses, for example) in an overt manner without awareness or understanding.

冲动行事：不知不觉中公开地表示（例如，无意识的冲动）

act up

To misbehave.

行为不良

To malfunction.

发生故障

&I{Informal} To become active or troublesome after a period of quiescence

【非正式用语】 疾病发作：一段时间的平静之后变得活跃或令人讨厌

My left knee acts up in damp weather. Her arthritis is acting up again.

我的左膝一到阴湿天气就犯病。她的关节炎又犯了

act of God

an instance of uncontrollable natural forces in operation (often used in insurance claims)

[常用于保险索赔]不可抗力

act of grace

a privilege or concession that cannot be claimed as a right

恩典，大赦令

catch someone in the act

(一般作 be caught in the act)surprise someone in the process of doing something wrong

当场抓住（或发现）某人做坏事

the thieves were caught in the act.

窃贼们被当场抓住。

clean up one's act

behave in a more acceptable manner

改进举止

get one's act together

(informal)galvanize oneself into organizing one's life or affairs effectively

(非正式)（使自己的生活处事）有头绪；有条有理地行事

get (或 be) in on the act

(informal)become or be involved in a particular activity, in order to gain profit or advantage

(非正式)（为获得利益或有利条件而）加入（或参与）（活动），插一手

a hard (或 tough) act to follow

an achievement or performance which sets a standard regarded as being hard for others to measure up to

难以取得的成就（或成绩）

in the act of

in the process of

在…过程中

they photographed him in the act of reading other people's mail.

他们拍下了他私看他人信件的行为过程。

be in on the act

To be included in an activity.

参与：参加行动

clean up (one's) act&I{【俚语】}

To improve one's behavior or performance.

改进举止：改进某人的举止或表现

get into the act

To insert oneself into an ongoing activity, project, or situation.

加入，参与：中途加入到进行中的活动、项目或形势

get (one's) act together&I{【俚语】}

To get organized.

组织起来，有头绪