One way to hold humpback is to draw a single line: a back that does not run straight, but lifts into one rounded curve and comes down again. That curve is the whole word. Everything else the word does is a question of what is wearing it — a whale, a person, a hill — and once you can see the line, you can see why one word covers all three.
「humpback」可以想成一條線：一個背不是平的，中間拱起一個圓弧，再落下去。這條弧就是整個字。剩下的差別只在於「這個弧長在誰身上」——鯨魚、人，還是一座山。只要先把線看清楚，就會懂為什麼同一個字管得了這三件事。
From the word’s history
The word is simply hump plus back, so the picture is written into it: a back with a hump.
這個字就是 hump（隆起）加 back（背）拼起來的，所以那個畫面等於直接寫在字面上：一個帶著隆起的背。後面每一個用法，都是這條弧被放到不同的東西上。
Wiktionary, "humpback"
登入就可以看每一支怎麼連回核心畫面。