flunk

Alteration of funk, or perhaps a blend of flinch +‎ funk.

• IPA^(key): /flʌŋk/
• Rhymes: -ʌŋk

flunk (third-person singular simple present flunks, present participle flunking, simple past and past participle flunked)

1. (US, transitive, intransitive) Of a student, to fail a class; to not pass.

   He flunked math, again.

2. (US, transitive) Of a teacher, to deny a student a passing grade.

   Unsatisfied with Fred's progress, the teacher flunked him.

3. (US, dated, informal) To shirk (a task or duty).
4. To back out through fear.

• flunk out