If you do not study, you will flunk out of school.
flunk out
idiomTo fail to finish school, or a given subject, program or course, due to academic shortcomings; i.e., to have too many flunking or failing grades (marks).
He spent all his time playing video games instead of attending classes, so he eventually flunked out of university.
Despite his initial promise, his persistent refusal to engage with the curriculum ensured he would inevitably flunk out of the prestigious program.
Last updated April 17, 2026