Soplonazo, me acabas de delatar. 用 英語 (美國) 要怎麼說？

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"Snitched on [me]" is very common, this is very informal English, almost slang. So it works if the context is really informal. There are other expressions too, "ratted on me", "sold me out".

It's more difficult if it's a formal setting, like an office. In that case, "betrayed me" or "informed on me" would probably be more appropriate.

I hope this helps a bit!