夌 is the historic root of two common modern characters:
凌 (with ice radical = 'to encroach / overcome / ice') and
陵 (with mound radical = 'imperial tomb / hill'). The graph itself shows a person hauling himself up a steep step — 'overstep / climb over' is the underlying image. As a personal name in mythology,
夌 appears in some Han-era genealogies as Emperor Yao's father.