yodan verb with 'gu' ending (archaic), intransitive verb
purify oneself; cleanse spiritually; repent
Archaic intransitive verb referring to ritual purification, especially in Shinto or classical contexts. Modern Japanese uses 禊をする or 身を清める instead.
In the Kojiki, it is written that Izanagi-no-Mikoto purified himself at Awagihara by the river-mouth of Tachibana in Himuka of Tsukushi.