This is the 17520th most frequent Korean word.
성수대교나
"성수대교나" does not have a standalone definition in Korean. It seems like a part of a sentence or phrase related to "Seongsu Bridge" (성수대교), a bridge in Seoul, Korea.
'성수대교나' is used to present an option, implying 'either the Seongsu Bridge or another bridge'.
나는 성수대교나 한강대교를 걸어볼까 생각하고 있어요.
I am thinking of walking across either the Seongsu Bridge or the Han River Bridge.
'성수대교나' is used as a subject marking the Seongsu Bridge, indicating 'even the Seongsu Bridge, among other bridges'.
성수대교나는 아침에 보면 사람이 별로 없어요.
The Seongsu Bridge, observed in the morning, usually has few people.
In this usage, '성수대교나' functions to indicate one of the possible bridges he crosses, showing an inclusive option.