noun
severe scolding; dressing-down
Colloquial noun for a harsh reprimand, often from a superior. Literally 'big eyeball', evoking the image of being glared at.
遅刻したら、部長から大目玉を食らった。
When I was late, I got a severe scolding from the department head.
そんなことをしたら、先生に大目
If you do that, you'll get a real dressing-down from the teacher.