The difference between Fink and Grass up
When used as verbs, fink means to betray a trust, whereas grass up means to betray by informing on.
Fink is also noun with the meaning: a contemptible person.
check bellow for the other definitions of Fink and Grass up
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Fink as a noun (chiefly, US, slang):
A contemptible person.
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Fink as a noun (chiefly, US, slang):
An informer.
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Fink as a noun (chiefly, US, slang):
A strikebreaker.
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Fink as a verb (chiefly, US, slang):
To betray a trust; to inform on.
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Fink as a verb (dialectal, [[th-fronting]]):
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Grass up as a verb (UK, slang):
To betray by informing on.