名詞 gag:

1. a humorous anecdote or remark intended to provoke laughter
   同義詞：joke, laugh, jest, jape
2. restraint put into a person's mouth to prevent speaking or shouting
   同義詞：muzzle

動詞 gag:

1. prevent from speaking out
   同義詞：muzzle
2. be too tight; rub or press
   同義詞：choke, fret
3. tie a gag around someone's mouth in order to silence them
   同義詞：muzzle
4. make jokes or quips
   同義詞：quip
5. struggle for breath; have insufficient oxygen intake
   同義詞：choke, strangle, suffocate
6. cause to retch or choke
   同義詞：choke
7. make an unsuccessful effort to vomit; strain to vomit
   同義詞：heave, retch

1. The burglars bound him hand and foot and placed a gag in his mouth.
   夜盜們捆住了他的手腳，并用東西塞住他的嘴。
2. The new censorship laws is an attempt to gag the press.
   新的新聞審查法目的在于剝奪新聞界的言論自由。
3. The new censorship laws are an attempt to gag the press.
   新的新聞審查法目的在於剝奪新聞界的言論自由。

gag

n.（名詞）
Something forced into or put over the mouth to prevent speaking or crying out.
塞口物，口銜：強塞進嘴里或壓在嘴上防止出聲的東西
An obstacle to or a censoring of free speech.
言論限制：對言論自由的審查或言論自由的障礙
A device placed in the mouth to keep it open, as in dentistry.
張口器：如牙科中放在嘴里使嘴張開的裝置

A practical joke.
惡作劇
A comic effect or remark.See Synonyms at joke
噱頭：滑稽的效果或言談參見 joke
The act or an instance of gagging or choking.
哽喉，嗆到：阻塞或窒息的行為或事例
v.（動詞）
gagged,gag.ging,gags
v.tr.（及物動詞）
To prevent from speaking or crying out by using a gag.
堵住嘴：塞住嘴以防說活或喊叫
To stop or restrain from exercising free speech:
抑制言論自由：
例句：
censorship laws aimed at gagging the press.
意在抑制新聞自由的新聞檢查法

To cause to choke, retch, or undergo a regurgitative spasm.
使窒息，作嘔：使窒息、作嘔或經(jīng)受反胃的發(fā)作
To keep (the mouth) open by using a gag.
用張口器將嘴張開
To block off or obstruct (a pipe or valve, for example).
阻塞（如管道或閥門）
v.intr.（不及物動詞）

To experience a regurgitative spasm in the throat, as from revulsion to a food or smell or in reflexive response to an introduced object.
作嘔：如喉嚨中產(chǎn)生作嘔感等對食物或煙味強烈反感或?qū)κ褂梦锲返谋灸芊磻?yīng)
To retch or choke.
窒息，作嘔
To make jokes or quips.
開玩笑，說俏皮話

來源：
From Middle English gaggen [to suffocate]
源自 中古英語 gaggen [使窒息]
[perhaps of imitative origin]
[可能源于模仿]