Godan verb with 'gu' endingintransitive verb to gargle;to rinse (the mouth)

Godan verb with 'gu' endingtransitive verb word usually written using kana alone to rinse (one's mouth);to gargle

expressions (phrasessu verb - precursor to the modern suru idiomatic expression to refuse stubbornly to admit one is wrong;to rinse one's mouth with a rock and rest one's head in a river