One way to hold this word: a blade gets thinner and thinner until it ends in a single fine line. There is almost nothing there — no width to stand on, no flat place to rest. Anything set on that line touches it along one thread and has nothing holding it to either side. Every use of knife-edge can be read off that picture: the line itself, the thing balanced on it, and the feeling of being the one up there.
這個字的核心畫面，可以想成一把刀越磨越薄，最後收成一條細線。那條線幾乎沒有寬度。沒有平面可以站，也沒有東西可以扶。任何放上去的東西，只沿著一條線接觸，兩邊都空著。knife-edge 的各種用法，就像都從這條細線長出來：線本身、停在線上的東西，還有站在上面那個人的心情。
登入就可以看每一支怎麼連回核心畫面。