We have 風木 tagged as rare. No need for the x-ref.

@@ -12 +11,0 @@
-<xref type="see" seq="2582660">風木</xref>

Aligning.

@@ -19 +19 @@
-<gloss>thinking about one's deceased parents (particularly about having failed in one's filial duties while they were alive)</gloss>
+<gloss>regret for not appreciating one's parents when they were alive</gloss>

デジタル大辞泉「風樹」の解説
ふう‐じゅ【風樹】
１ 風に吹かれて揺れている木。風木。
２ 「風樹の嘆」に同じ。
「眺めて居ると―の思いに堪え難いから」〈梅崎・贋の季節〉

《「韓詩外伝」九から》静止していたいのに、風に吹かれて揺れ動かざるをえない樹木のように、子供が孝行をしたいと思うときには、すでに親が死んでいてどうすることもできないという嘆き。風樹の悲しみ。風木の嘆。風木の悲しみ。


https://kotobank.jp/word/風樹-615836#:~:text=ふう‐じゅ【風樹】&text=① 風に吹かれる,風木。&text=② (%E3%80%8C%E9%9F%93%E8%A9%A9%E5%A4%96%E4%BC%9D%E2%80%90,%E6%80%9D%E3%81%86%E6%B0%97%E6%8C%81%E3%82%92%E3%81%84%E3%81%86%E8%AA%9E%E3%80%82

精選版 日本国語大辞典「風樹」の解説
 すでに死んでしまった親を思う気持をいう語。風木。

The entire definition in daijisen is ２ 「風樹の嘆」に同じ。

This is not consistent across all dictionaries, so I went with the "particularly" option.

But, given the daijisen entry, I think the derivation is probably from 風樹の嘆 backwards to 風樹, rather than the other way around (as it appears before this edit). I think the swaying trees are tied up in some sense of melancholy or regret.

@@ -20 +20 @@
-<gloss>thinking about one's deceased parents</gloss>
+<gloss>thinking about one's deceased parents (particularly about having failed in one's filial duties while they were alive)</gloss>

not a verb

@@ -17,2 +17,4 @@
-<xref type="see">風樹の嘆</xref>
-<gloss>to think about one's deceased parents</gloss>
+<xref type="see" seq="2582680">風樹の嘆</xref>
+<xref type="see" seq="2582680">風樹の嘆</xref>
+<misc>&arch;</misc>
+<gloss>thinking about one's deceased parents</gloss>