to rinse one's mouth; to gargle

mouthwash

to rinse one's mouth with water; to gargle

to rinse the mouth and wash the face

to rinse one's mouth with river water; (fig.) to live a hermit's life

Liang Shuming (1893-1988), modern philosopher and teacher in the neo-Confucian tradition

Natsume Sōseki (1867-1916), one of the first modern Japanese novelists

see 枕石漱流[zhen3 shi2 shu4 liu2]

to live a hermit's life (in seclusion); a frugal life (idiom)