vt.

1. 扮演
   He acted Othello at the Royal Theater that evening.

   那天晚上他在皇家劇院扮演奧賽羅。

2. 裝出；舉動像
   He acted the wise man who knew everything and never made mistakes.

   他假裝成是無所不知，從不出錯的聰明人。

vi.

1. 做事，行動[（+on/for）]
   We should act immediately.

   我們應該立即行動。

2. 起作用，見效[（+on/upon）]
3. 假裝；演戲，表演
   The actress acts very well.

   這位女演員的表演非常出色。

4. 扮演，充當[（+as）]
   John acted as chairman in his absence.

   他不在時，約翰充當主席。

5. 舉止，表現[L]
   I don't think she acted right.

   我認為她做得欠妥。

n.[C]

1. 行為；行動
   get one's act together

   【俚】冷靜下來仔細籌劃（吸食迷幻藥，迷惘失向後重新振作）

   My first act was to run into the bedroom.

   我做的第一件事便是跑進臥室。

2. 【戲】（常大寫）幕；節目
   She was magnificent in Act One of "Carmen".

   她在《卡門》的第一幕中演得好極了。

3. （常大寫）法案，法令
   Would you tell us something about the new Education Act?

   請你給我們講講新的教育法好嗎？

4. 【口】裝腔作勢[S1]
   He's just putting on an act.

   他只是裝腔作勢罷了。

v.

1. take action; do something.
   ▸ (act up) informal behave badly.
2. (act for/on behalf of) represent on a contractual or legal basis.
   ▸ [as adj. acting] temporarily doing the duties of another.
3. take effect or have a particular effect.
4. perform a fictional role in a play or film.
   ▸behave so as to appear to be:

   I acted dumb.
   ▸ (act something out) perform a narrative as if it were a play.

n.

1. a thing done.
2. a simulation or pretence.
   ▸a particular type of behaviour or routine:

   he did his Sir Galahad act.
3. Law  a written ordinance of Parliament, Congress, etc.
4. dated a record of the decisions or proceedings of a committee or an academic body.
5. a main division of a play, ballet, or opera.
6. a set performance:
   her one-woman poetry act.