瑜伽師地論略纂 8.39

8.39

論解如何應往中云「不墮山峯」，山之與峯云何名墮？此中墮者，謂墮住，非墮落，不令墮山峯也。

In the treatise's explanation of how one should go, it says "not falling onto a mountain peak." How could a mountain and a peak be spoken of as "falling"? Here, "falling" (duo) means falling into and staying, not falling down; it means not allowing oneself to abide on a mountain peak.