GG5: そう言われればなるほど思い当たるふしがある. Now you mention it, I remember. | That 「calls to 
mind [reminds me of] something I had forgotten.
今にして思えば, そのときの彼の行動に思い当たるふしがある. Come to think of it, now I think I understand 
why he acted the way he did. | With hindsight, the reason for his behavior has occurred to 
me.

Maybe this works?

@@ -17 +17,2 @@
-<gloss>to have something familiar about it</gloss>
+<gloss>to be reminded of something</gloss>
+<gloss>to understand a point</gloss>

i'm unsure of how best to gloss this but i think this mix-and-match approach is potentially confusing.

sense 1 is written as if the person remembering as the subject, and sense 2 is written as if the thing remembered is the subject.  because this entry doesn't start with に, i think sense 1 has the better perspective for the entry, but i don't like the gloss used

https://www.weblio.jp/content/思い当たるふしがある
https://eow.alc.co.jp/search?q=思い当たる節

Was used in reference to speech in an unrecognized foreign language.

@@ -16,0 +17 @@
+<gloss>to have something familiar about it</gloss>