枕石漱流

zhěn shí shù liú

to live a hermit's life (in seclusion)

a frugal life (idiom)

枕

zhěn

(bound form) pillow

石

shí

abbr. for Shijiazhuang 石家莊|石家庄[Shi2 jia1 zhuang1], the capital of Hebei

漱

shù

to rinse one's mouth with water

流

liú

to flow