Third-person singular present tense of flunk; he/she/it fails a test or class, or that person fails to accomplish something.
From 'flunk,' likely from German 'plumpen.' The -s suffix creates the third-person singular present tense form.
You can 'flunk a test,' 'flunk out,' or 'flunk someone'—the verb is flexible enough to work as both intransitive (the student flunks) and transitive (the teacher flunks the student), showing English's adaptability.
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