One way to hold devolve: something rolls down one step. It was up there, held by the centre, the head office or the person before; now it is down here, and whoever is at the lower step has it. Two things follow from that picture. The thing itself does the moving, so it is usually the subject of the sentence, and the direction is always down — never up. What rolls down can be a power, a piece of property, or the whole state of a situation.
From the word’s history
Devolve was borrowed from Latin devolvo, to roll or tumble down, from de- (down) and volvo (roll). English once used it literally for rolling something down, and that older use is now obsolete, but the direction it carries has stayed in every modern sense.
devolve 借自拉丁文 dēvolvō，意思是「往下滾、往下翻落」，由 dē-（往下）加 volvō（滾動）組成。英文早期真的拿它講「把東西往下滾」，那個用法今天已經廢棄了。但它帶著的方向留了下來——現在每一個意思都還是往下走。
Wiktionary etymology tree supplied in this packet (source_ref kaikki:3f6f69a190036ae4:1112584466:18634): borrowed from Latin dēvolvō (roll or tumble off or down), from dē- + volvō (roll). The obsolete literal sense is evidence row wikt:devolve:verb:6.
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