Date: 1800-1900
Origin: Perhaps from flinch + funk 'to be afraid (of)' (18-21 centuries); FUNK2


flunk informal especially American English
1 [intransitive and transitive]SE to fail a test:
Tony flunked chemistry last semester.
2 [transitive]SE to give someone low marks on a test so that they fail it [= fail]:
She hadn't done the work so I flunked her.

flunk out

phrasal verb
SE to be forced to leave a school or college because your work is not good enough
flunk out of
Ben flunked out of college.

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