intransitive verb
Definition: To fail to achieve a passing grade in a course or exam.
Example: He was worried he might flunk the math test.
noun
Definition: A failing grade or the act of failing in a course or exam.
Example: He received a flunk in math class this semester.
transitive verb
Definition: To fail a test or course, meaning you did not achieve the required score or performance.
Example: I was so worried that I would flunk my math exam.