From Longman Dictionary of Contemporary Englishflunk out phrasal verb informal especially American EnglishSELEAVE A SCHOOL OR COLLEGEto be forced to leave a school or college because your work is not good enough of Ben flunked out of college. → flunk→ See Verb table
Examples from the Corpus
flunk out• You either pass and get your degree or flunk out.• It was extremely humiliating to flunk out of law school like that.flunk of• She found out when I flunked out of college.• It was, of course, extremely humiliating to flunk out of law school.• Leo flunked out of Yale in his junior year. 