This is the 11796th most frequent Korean word.
내서
"내서" typically means "Nae-seo," a location or town in South Korea.
Here, "내서" refers to the act of publishing or producing something, in this case, a book.
책을 내서 많은 사람들에게 읽혔습니다.
The book was published and read by many people.
In this sentence, "내서" is used to mean setting or presenting something, like giving a question to assess understanding.
문제를 내서 학생들의 이해도를 점검했습니다.
A question was given to check students' understanding.
"내서" is used in this sentence to mean presenting or putting forth an idea or presentation.