도강

Etymology 1
. The North Korean sense probably arises from how crossing the into China is the main route used by North Korean defectors.

Noun

 * 1) crossing a river
 * 2)  to defect, leave North Korea for another country.

Noun

 * 1) sneaking into a lecture that one hasn't enrolled in.

Etymology 3
.

Noun

 * 1)  the act of students reciting what one has learnt in front of a teacher.
 * 2)  a class for soldiers