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As a verb, to snitch (on someone) means to tell an authority, like a teacher, boss, or the police, about something wrong someone else did — usually said with a negative, tone, as if the person is being . As a noun, "a snitch" is a person who does this, especially someone who tells the police about other criminals.
（口語）打小報告、告密；（名詞）抓耙仔、告密者
組成The origin isn't fully certain, but the word may have started as old slang for "nose," later coming to mean someone who noses around and informs on others — I wouldn't state that history as definite fact.
原始詞典資料8 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
snitchverb/snɪt͡ʃ/
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slangTo inform on someone, especially in betrayal of others.
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slangTo contact or cooperate with the police for any reason.
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datedslangTo steal, quickly and quietly.
- Besides, I shall require your help in snitching the pig. But I was forgetting. You are not abreast of that side of our activities, are you? Emsworth has a pig. The Duke wants it.
snitchnoun/snɪt͡ʃ/
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slangA thief.
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slangAn informer, one who betrays their group.
- A fuck nigga, that's that shit I don't like A snitch nigga, that's that shit I don't like
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slangA nose.
- 'Yah, I wouldn't git a second-'and dress at a pawnbroker's!' 'Garn!' said Liza indignantly. 'I'll swipe yer over the snitch if yer talk ter me. [...] "
- He added in conclusion that he strongly disliked the police coming and sticking its nose into his affairs and, since the horror which such actions inspired in him was not far from making him wish to vomit, he extracted from his pocket a silken square of the colour of the lilac flower (the one that isn’t white) but impregnated with Barbouze, the Fior perfume, and with it dabbed his snitch.
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A tiny morsel.
- "He pays for the food you eat," said the woman. "Yeah," said the boy. "And I earn every snitch doing everything ever gets done around here."
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A ball used in the sport of Quidditch: the Golden Snitch.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。