virst

Etymology 1
Underlyingly *virt-ti, an iR-vocalization of the zero grade version of. The original meaning of the verb was "to become" (without any negative connotations.)

Verb

 * 1)  to degenerate, become perverted

Etymology 2
Underlyingly *vird-ti. Same origin as 🇨🇬 🇨🇬. Ultimately from, with the infinitive from zero grade and present from full grade.

As the modern has been relegated to outbursts or eruptions (of a volcano, emotions, etc.) it is practically never used in the present tense, consequently most natives will not know how to conjugate it in present, especially because it shows ablaut, present marker -st- will most likely be used.

Verb

 * 1)  to erupt