-음

Etymology
from,.

This suffix is the most common Middle Korean nominalizer, including in the gugyeol sources of the fourteenth century and in the Hangul sources of the fifteenth and sixteenth centuries, but is very rarely attested in pre-fourteenth-century Old Korean sources. Choe 2017 comments that no intermediary stage appears to exist, and that this sudden post-fourteenth-century dominance of an apparently novel grammatical suffix is puzzling and difficult to explain.

The older nominalizers were realis and irrealis, both of which are now adnominal suffixes.

In Middle Korean, proper only derived nouns from verbs, while verbal substantives ("-ing", "that...") were formed by bimorphemic, the first element traditionally being analyzed as the "modulator" suffix. The "modulator" disappeared around the late sixteenth century, leaving to do double duty.

Suffix

 * 1) -ness; -tion; -ment
 * 2)  the act of, the process of, -ing, being, to be
 * 1)  the act of, the process of, -ing, being, to be
 * 1)  the act of, the process of, -ing, being, to be
 * 1)  the act of, the process of, -ing, being, to be

Usage notes

 * In non-formal language, is used instead to turn verbs and adjectives into substantives.
 * This suffix has an epenthetical vowel and therefore provokes verbal irregularities in certain stems, e.g. >.
 * This suffix does not elide preceding ; instead, the epenthetical vowel is lost, e.g. >.