으니까 맞다

since X, it must be right

"-(으)니까" gives the grounds and 맞다 confirms: since it came out in our press it's probably right, since I didn't throw it away that's a fair statement, well he brought something so it must be right. It is the shape of a quick verification out loud, usually ending in -죠, -지, -겠지 — the endings for a conclusion you expect agreement on. Note one line uses a different 맞다, the one meaning "get hit": you could die from it, so don't get hit.

Register: conversational