a nark for sb/sth
for 后接接收情报的一方，常为警方或执法机构。
He turned out to be a nark for the police.
结果他是警方的线人。
线人；告密者
narks — plural of nark
缉毒警察；负责毒品案件的警官；为警方工作的告密者或间谍；警察的眼线；密探
a person who secretly gives information to the police
负责毒品案件的警官
a lawman concerned with narcotics violations
为警方工作的告密者或间谍
an informer or spy working for the police
The gang suspected that one of their members was a nark working for the police.
那个团伙怀疑他们中有一个成员是给警察当眼线的。
用法提示：nark 作名词，意为警方的线人。
Three narks infiltrated the protest to gather evidence for the authorities.
三名警方眼线渗入抗议活动，为当局收集证据。
用法提示：narks 是 nark 的复数形式，表示多个密探。
He was careful not to show his notebook, fearing someone might think he was a nark.
他小心不露出笔记本，担心别人会以为他是密探。
用法提示：nark 作名词，指警察的卧底或告密者。
for 后接接收情报的一方，常为警方或执法机构。
He turned out to be a nark for the police.
结果他是警方的线人。
强调临时充当线人，而不是正式身份。
She agreed to act as a nark for the investigators.
她同意为调查人员充当线人。
among 后接被怀疑藏有告密者的群体，narks 用复数。
The gang feared there were narks among them.
团伙担心他们中间有线人。
grammar · medium
易错句子He is nark for the police.
正确表达He is a nark for the police.
nark 是可数名词，单数形式前必须加限定词；汉语名词可直接作表语，英语则要加不定冠词 a。
grammar · medium
易错句子Two nark were arrested last night.
正确表达Two narks were arrested last night.
nark 是可数名词，受数词 two 修饰时要用复数形式 narks，汉语名词本身不变，容易漏掉词尾 -s。
grammar · medium
易错句子He works as a nark of the police.
正确表达He works as a nark for the police.
表示“为警方工作的线人”用介词 for 说明为谁效力；of 只表示所属关系，不能表达这种服务对象。
nark 是英式口语，多指为警方提供情报的线人，也可指缉毒警察，带贬义；snitch 更通用（美式也常说），侧重向老师、上级或权威打小报告的人，还可作动词。指缉毒警察时不能用 snitch。
grass 与 nark 同为英式俚语，都可指告密者，但 grass 多指罪犯圈子里向警方出卖同伙的人，常见于 supergrass（大告密者）等说法；nark 还能指缉毒警察，grass 没有这个意思。
mark 与 nark 只是读音接近（nark 多一个开头的 n），意义毫无关系：mark 指记号、分数或骗子选中的目标，绝不能用来指告密者；听辨时注意开头的 n 音。
nark + -ed
nark + -y
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