Wurdahuzdą: Proto-Germanic dictionary

suffix verb Weak class 4 forms intransitive fientive or inchoative verbs, usually with the sense ‘to become X, come into the state X’; often deadjectival or deverbal From Early Proto-Germanic *-nō- ~ *-na- + *-ną (infinitive suffix), ultimately from Proto-Indo-European *-néh₂- ~ *-n̥h₂-, the nasal-present suffix that arose by reanalysis of nasal-infixed presents to laryngeal-final roots. The suffix formed chiefly fientive or inchoative intransitives in PGmc, often from zero-grade verbal bases or adjectives Ringe 2017: 201–203. Cognate or closely parallel formations include -णा- / -ण-, Old Irish -na-, Baltic -in-/-ina-, and Proto-Slavic *-nǫti. Note

This suffix was preserved as a separate class only in Gothic. In Old High German, it mostly merged with the third weak class, while in the other descendants it merged with the second weak class.