undercover
[ˌʌndərˈkʌvə(r)]
adj.
暗中进行的，秘密的;
秘密从事的;
私下的，隐蔽的;
从事间谍活动的;
n.
卧底;
例句:
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Swanson persuaded Hubley to work undercover to capture the killer.
斯旺森说服赫布利去做卧底以便将凶手抓获。
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He then described the rigors of undercover work.
来自NEWYORKER
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Officers had tailed the gang from London during a major undercover inquiry.
在一次重大的秘密调查行动中，警察从伦敦就盯上了那帮匪徒。
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Journalists informed police who planted an undercover detective to trap Smith.
记者通知了警方，后者于是为诱捕史密斯而安插了一名卧底侦探。
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Undercover FBI agents provided the suspect with the fake bomb.
来自VOA
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If they went, they were well undercover.
来自VOA