Very high or deep; often used in literature to describe mountains or cliffs, based on the ancient unit of measurement [[仞|仞|ren4]].

Describing a mountain that is very tall and steep; literally ten thousand [[仞|仞|ren4]], which is an ancient measurement of height

(idiom) describes a cliff or mountain rising steeply to a great height; imposing and lofty; literally "standing like a wall a thousand [[仞|仞|ren4]] high"