From Wiktionary, the free dictionary
-kın
- Assimilated form of -gin after the vowels A / I.
- diz- (“to arrange in a row”) + -gin → dizgin (“rein”)
- sal- (“to let loose, to let go”) + -gın → salgın (“outbreak, epidemic”)
- dur- (“to stop”) + -gun → durgun (“still, calm”)
- ol- (“to be, to become”) + -gun → olgun (“ripe”)