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

  1. Fink as a noun (chiefly, US, slang):

    A contemptible person.

  2. Fink as a noun (chiefly, US, slang):

    An informer.

  3. Fink as a noun (chiefly, US, slang):

    A strikebreaker.

  1. Fink as a verb (chiefly, US, slang):

    To betray a trust; to inform on.

  1. Fink as a verb (dialectal, [[th-fronting]]):

  1. Grass up as a verb (UK, slang):

    To betray by informing on.

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