一切經音義 48.243

48.243

塵宇（又作禹二形同于甫反屋宇也釋名云宇羽也如鳥羽翼自覆蔽也今謂在家如屋中塵恒被坌汙不得安靜也）。

Dusty dwelling (塵宇: also written 禹; both forms have the fanqie 于 + 甫 [yǔ]. It means a house or dwelling. The Shiming states: '宇 (dwelling) means 羽 (feathers), like the wings of a bird covering and sheltering oneself.' Here it refers to being a householder, which is like dust inside a house constantly soiled and dirtied, unable to attain quietude).