-질

Possibly from 짓— (jit-, “to make, to build”) / 지— (ji-, “to become, to grow, to form”) + —ㄹ (-l, prospective suffix). Compare 짓 (jit, “act, deed”).

질 • (-jil)

1. A depreciative noun-forming suffix attached to nouns.

   선생질 (先生—, seonsaengjil, “(depreciative) being a teacher”), 첩질 (妾—, cheopjil, “concubinage”), 손가락질 (son'garakjil, “pointing fingers”), 서방질 (書房—, seobangjil, “cuckolding”)

2. A nominalisation suffix attached to nouns, verbs or adjectives. The act of doing ...

   톱질 (topjil, “sawing”), 망치질 (mangchijil, “hammering”), 대패질 (daepaejil, “planing”), 부채질 (buchaejil, “fanning”), 바느질 (baneujil, “sewing”)