This is the 12620th most frequent Korean word.
대위다
"대위다" is not a standard Korean word. It may be a typo or a dialectal term.
Here, '대위다' refers to a rank in the military, specifically 'captain'.
그 사람은 군대에서 대위다.
That person is a captain in the military.
In this instance, '대위다' is used figuratively, expressing a likelihood of an event occurring, usually negative.
그 계획은 실패할 대위다.
The plan is likely to fail.
Here, '대위다' is contextualized as part of '답게', indicating someone acting appropriately to their role or title, in this case, 'captain'.