snitch

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Individually, they could choose (without being able to talk to the others) either to snitch on their team-mates or to stand by them.
就个体而言，他们（不能与他人交谈）可以选择告发队友，或与守口如瓶。
Google today released an open-source tool called DOM Snitch that tries to flag Web site software that would be dangerous to run in a browser.
Google今天发布了一个名为DOM Snitch的开源工具，可以帮你找出网站上的恶意软件。
We need to win back the right to photograph our human heritage in museums and galleries, and we need to beat back the snitch-cams rent-a-cops use to make our cameras
我们有必要争取我们可以在博物馆和美术馆拍摄人类遗产的权利。我们有必要打击使用摄像头就好似租用警察窥视我们的行为，让摄像机待在我们自己的口袋里。

And I think, in large part, it's due to this culture of, you know, gangster life and thug life that's become so accepted, acceptance of crime, acceptance of drug dealing, the no-snitch campaign, this kind of thing that I think is just poisonous for young minds because that's who's doing it, young people often involved in fighting over drug turf, killing each other.
NPR: Week in Review: Primaries Play Leapfrog
How this country has changed, I thought: the son of the President is now an ordinary snitch, a man doomed to look over his shoulder for six one-hour episodes, and then die invisibly, his passing just a footnote to a larger drama that has little to do with him.
NEWYORKER: The Idiot President

(TELL SECRETLY) to secretly tell someone in authority that someone else has done something bad, often in order to cause trouble
(STEAL) to steal something

To snitch on a person means to tell someone in authority that the person has done something bad or wrong.
A snitch is a person who snitches on other people.