Flunk
WordNet
noun
(1) Failure to reach a minimum required performance
"His failing the course led to his disqualification"
"He got two flunks on his report"
verb
(2) Fail to get a passing grade
"She studied hard but failed nevertheless"
"Did I fail the test?"
WiktionaryText
Verb
- Of a student, to fail a class; to not pass.
- He flunked math, again.
- (transitive) Of a teacher, to deny a student a passing grade.
- Unsatisfied with Fred's progress, the teacher flunked him.