| 1. | to fail in a course or examination. |
| 2. | to fail to get a passing mark in: to flunk math. |
| 3. | to give a failing grade to; remove (a student) as unqualified from a school or course. |
| 4. | a failure, as in a course or examination. |
| 5. | flunk out, to fail and be unable to continue in: He flunked out of flight school. |
flunk out
Expel or be expelled from a school because one's work does not meet the required standard. For example, He flunked out of Harvard after just one year. [Slang; early 1800s.]
Fail at anything, as in The camera ran out of film so we flunked out as photographers. [Slang; late 1800s]