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Definition of Flunk out
1. Verb. (idiomatic) To fail to finish school, or a given subject or course, due to academic shortcomings; i.e., to have too many flunking or failing grades (marks). ¹
2. Verb. (idiomatic) (of an educator or institution) To impose failing grades on (a student), often requiring a retaking of the course or academic year. ¹
¹ Source: wiktionary.com