godan verb (-nu), intransitive verb
Kansai dialect usage of the archaic verb いぬ, meaning to leave or go home. Still heard in some Kansai regions, but not standard Japanese.
もう遅いし、そろそろ往ぬわ。
It's late, so I'll be heading home soon. (Kansai dialect)
irregular nu verb, intransitive verb
Archaic verb meaning to go, leave, pass (of time), die, or rot. Found in classical Japanese texts; not used in modern standard Japanese. The various meanings are context-dependent.
古語では「いぬ」は「去る」「死ぬ」などの意味で使われた。
In classical Japanese, 'inu' was used to mean 'leave', 'die', and so on.
時が往ぬるままに、すべては変わった。
As time passed, everything changed. (archaic style)