gag on
collocation被某物呛住；因某物作呕
He started to gag on a piece of bread.
他被一块面包呛到，开始干呕。
作呕，干呕；窒息
gags — third person singular of gag
先理解核心含义，再看它在真实句子里的用法。
作呕，干呕；窒息
to choke or retch; to feel the vomiting reflex
The foul smell from the dumpster made me gag.
垃圾箱散发出的恶臭让我作呕。
常与 on 连用，如 gag on sth
经历呕吐反射。
To experience the vomiting reflex.
引起恶心作呕。
To cause to heave with nausea.
堵住某人的嘴以限制其说话。
To restrain someone's speech by blocking his or her mouth.
用开口器撬开或撑开。
To pry or hold open by means of a gag.
gag
Base
原形
gags
3rd person
第三人称单数
gagging
-ing
现在分词
gagged
Past
过去式
gagged
Past participle
过去分词
He gags on the food.
他因食物作呕。
They gagged the prisoner.
他们堵住了囚犯的嘴。
She is gagging from the smoke.
她因烟雾而窒息。
规则变化，过去式、过去分词加-ed
The toddler gagged on a piece of fruit and started coughing.
幼儿被一块水果噎住，开始咳嗽。
The captors gagged the prisoners to keep them quiet.
绑架者堵住了囚犯的嘴以保持安静。
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被某物呛住；因某物作呕
He started to gag on a piece of bread.
他被一块面包呛到，开始干呕。
使某人作呕
The sight of the raw meat made me gag.
看到生肉让我作呕。
封住媒体的嘴；压制新闻界
The government tried to gag the press during the crisis.
政府在危机期间试图封住媒体的嘴。
被堵住嘴；被禁止发言
The prisoners were gagged to prevent them from shouting.
囚犯们被堵住嘴以防他们喊叫。
非常渴望；迫切想要（尤其指饮料、食物等）
After the long flight, I was gagging for a shower.
长途飞行之后，我非常想冲个澡。
（表示恶心或厌恶）恶心死我了；真受不了
When he told that cheesy joke, she said, “Gag me with a spoon!”
他讲那个老掉牙的笑话时，她说：“恶心死我了！”
真是恶心死我了！
When she saw the cockroach, she said, "Gag me with a spoon!"
当她看到蟑螂时，她说：“真是恶心死我了！”
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联想：嘴里被塞布时只能发出“嘎”声，说不出话又想干呕，所以 gag 是堵嘴、作呕。
语域：neutral 常见场景：medical consultation、everyday conversation gag 表示“干呕、作呕”时，语域通常为中性，既可用于日常口语描述闻到难闻气味或看到恶心事物时的反应，也较常见于医疗场景中对症状的描述；不算正式，也不算粗俗。
及物和不及物用法：gag sb/sth（塞住…的嘴），gag on sth（因…窒息），gag about sth（开玩笑）
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.