vein
阞 centers on a vein, a channel or line within a larger structure. The meaning is narrow and concrete, with no clear abstract extensions from the given gloss.
阞 combines ⻖ (mound, hill) with 力 (strength). The exact historical development is uncertain, but it may relate to a vein-like ridge or channel in the earth.
The left side ⻖ suggests a mound or hill, and the right side 力 is strength. Picture a strong vein of mineral running through a hillside, like a visible line of ore.
For ロク, imagine a rock vein cutting through the hill: rock -> ロク, and the vein is a rocky channel.
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