日薄西山 rìbóxīshān on one's last legs Origin Definitions Defs Strokes Stroke Words Sentences Sents 日 rì noun sun (bound form) the sun; sunlight薄 bó to approach to get close to; to near or be on the verge of西山 xīshān western mountains (literary) Mountains in the west, or the sun setting behind the western mountains as a metaphor for old age or decline.