Not sure "rot" helps much.

@@ -14,0 +15 @@
+<gloss>deterioration</gloss>
@@ -16 +16,0 @@
-<gloss>deterioration</gloss>

sankoku: 古くなって、くちること。

Many, many "decay" collocations:
https://eow.alc.co.jp/search?q=腐朽

#1 reverso gloss is "decay".  No "deterioration". Seems consistent with definition.

くちる itself is "to rot; to decay​"

That said, looking at the eijiro glosses, some of them probably would be better as "deterioration". (especially as applied to buildings, though "decay" is often fine here).

Skimming the first page of yourei results, I'd say "decay" is probably the most frequently applicable. 

Google translated this as "decomposed" in this context: 遺骸は腐朽していた, but looking around, this seems like a very rare collocation (遺骸 + 腐朽), so probably not that important.

@@ -13,0 +14,2 @@
+<gloss>decay</gloss>
+<gloss>rot</gloss>
@@ -15 +16,0 @@
-<gloss>rot</gloss>

Meikyo vt and vi additions to n,vs entries
-*- via bulkupd.py -*-

@@ -12,0 +13 @@
+<pos>&vi;</pos>