Etymology
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flunk (v.)

1823, American English college slang, original meaning "to back out, give up, fail," of obscure origin, traditionally said to be an alteration of British university slang funk "to be frightened, shrink from" (see funk (n.1)). Meaning "cause to fail, give a failing mark to" is from 1843. Related: Flunked; flunking.

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Definitions of flunk
1
flunk (v.)
fail to get a passing grade;
Synonyms: fail / bomb / flush it
2
flunk (n.)
failure to reach a minimum required performance;
he got two flunks on his report
Synonyms: failing
From wordnet.princeton.edu