石に漱ぎ流れに枕す

いしにくちすすぎながれにまくらすishinikuchisusuginagarenimakurasu

expression · su verb - precursor to the modern suru

1. to refuse stubbornly to admit one is wrong
2. to rinse one's mouth with a rock and rest one's head in a river

Study it in Yanamino