For some reason? I can think of a multitude of reasons to struggle with those pesky rascals.
Actually, I would assume each of the ones you’re struggling with has its very own. Hi Nate, thanks for asking, I’ll give it a shot.
First off, 線 (line, track) is probably due to the fact that you didn’t learn 泉 (spring, fountain) yet. WK teaches it at Lvl 12.
So if we associate 白 with pure/clear (as in Christian symbolism), you get clear 水 springing up from below, hence a 泉 (spring, fountain).
So if you have a 泉 (spring, fountain) that spurts out a 糸 (thread), that gives you, assuming it’s not infinite, a 線 (line, or more precisely, a line segment).
白 (white/pure) + 水 (water) = 泉 (spring, fountain)
A spring where pure white aerated water bubbles up.
糸 (thread) + 泉 (spring, fountain) = 線 (line, track)
A thread springing up from a starting point, inevitably halting at an ending point, gives you a line/track between two points.
As for 緑 (green) and 縁 (brink, verge), they’re kinda high in stroke order, their semantic part 糸 isn’t that clearly associated with either, and their phonetic parts are pretty rare and extremely similar.
So let’s take it from the top and start with the semantic part:
緑 (green): As you probably know, China and Korea had 5 and Japan historically only 4 colours. What we today reference as green-blue-purple wasn’t differentiated in any language, meaning there wasn’t any kanji for green in general language. But in textile making there was, so it just got generalized over time from originally meaning green thread to just green. (A phenomenon you will revisit with other colour kanji like 紫 (purple), 紅 (crimson), 紺 (navy), which all underwent the same generalization.)
縁 (brink, verge): Likewise, it has its original meaning related to the textile industry. Originally referencing the edge/border of woven cloth. Before it generalized into meaning any kind of abstract edge, to now where it’s also associated with connection to a person and relationship, as well as fortune, fate and chance.
Now to the real nutcracker, the phonetic right part. WK takes, understandably, the easy way out on this one, making up a radical with katakana yo “wolverine”. Let’s try and paint a clearer picture.
緑 (green): So the unabbreviated phonetic part is written as 彔 (the only difference is that the second stroke used to be the first stroke and L-shaped). As a useful mnemonic identity, I recommend the meaning of a REEL that pulls something.
So the top wolverine part is like the reel, more clear in the unabbreviated version, and the bottom is some sort of depression filled with water where you can reel something out of.
So for example:
糸 (thread) + 彔 (reel that pulls) = 緑 (green)
A batch of now dripping green thread being reeled out of a coloring basin.
Or like in these next most popular use cases:
金 (metal) + 彔 (reel that pulls) = 録 (record, transcript)
A metal recording reel spins and captures sound or images, reeling them out of thin air to become recorded and transcribed.
彔 (reel that pulls) + 刂 (knife) = 剥 (peel)
A reel pulls a layer away while the knife cuts it free, so the outer layer gets peeled off.
縁 (brink, verge): For this phonetic part there is good and bad news. Bad news first, it’s the only Jōyō kanji using it (there is one other Jinmeiyō kanji and several other Hyōgaiji).
And now the good news… it underwent the exact same simplification as 彔 (reel that pulls) before (the second stroke was the first stroke and originally L-shaped instead of -), making it look like this: 彖. So let’s stay consistent with the top part and imagine it as a reel, and the bottom part is of course a pig. As for meaning, I found two associations, one of them being a running pig/boar, which is a perfect combo. So now you can imagine the fastest pig alive reeling its legs like in a cartoon before it dashes into the distance like lightning, only to be stopped by its pen wall, forcing it to run around the edge of it to tire out its zoomies.
糸 (thread) + 彖 (running along the edge) = 縁 (brink, verge)
A thread that runs around the perimeter of a piece of cloth is forming its edge, border, hem.
That concludes my earnest attempt. Please feel welcome to alter and modify this info in a way that suits your use. As you can see, the only free cheese is in the mousetrap. Following the seductive path of enlightenment comes with doing more and more work for diminishing returns. So choose your goalpost and make sure it’s not moving too fast.
