Flunk out
Definition 1 of 1
Pro Tip 1/3Academic Consequences
Flunk out implies serious academic failure leading to removal from an institution. 
If you don't study harder, you might flunk out of the program.
Pro Tip 2/3Negative Emotion
'Flunk out' can carry a stigma, suggesting personal fault or inadequate effort. 
She was embarrassed to flunk out and face her family.
Pro Tip 3/3Colloquial Usage
The phrase is casual and might not be appropriate in formal writing. 
He casually mentioned that he flunked out, but it's a serious issue.