這個拼法底下其實是3個不同的字，意思沒有關係， 只是長得一樣。下面分開列出來。跳到 快步疾走；竄 · 煤桶；煤斗 · 鑿沉（船）
Picture a small crab on wet sand. The steps are tiny and very fast, the body is held low, and in a second it is inside a hole. Two things happen together: speed, and staying out of sight. That is the whole word. When a person scuttles, the writer is putting the reader in front of the same picture — head down, short quick steps, gone before anyone looks up.
A second word, same spelling
Picture a wide metal bucket standing beside a fireplace, with a handle over the top and a lip that tips forward. It is shallow and open so that coal can be scooped in at the shed and poured out onto the fire. This is a thing from a house that burns coal, so today the word mostly turns up in novels and in rooms kept as they used to be.
From Middle English scutel, from Old English scutel ('dish, platter'), from Latin scutella, a small form of scutra ('flat tray, dish'). The oldest thing named is a shallow dish, which is why the coal container and a broad shallow basket share the word.
來自中古英文 scutel、古英文 scutel（盤子），再往前是拉丁文 scutella——scutra（平盤）的小稱。最早被命名的是一個淺盤子，所以裝煤的桶和「寬而淺的籃子」才會共用同一個字。
Wiktionary etymology 1 as supplied in this packet (kaikki:3f6f69a190036ae4:545200575)
A second word, same spelling
Picture a small covered opening cut into a ship. The hull is meant to be solid, and this hole was made on purpose. From that one picture the rest follows. A hole lets a sailor through; more holes let the sea in; and once the sea is in, the ship is gone for good. Later writers took the same picture off the water: a plan can be holed and go down just as finally.
The noun came into English from Middle French escoutille (compare French écoutille), traced further to Old Norse skaut ('corner of a cloth, of a sail') or Spanish escotilla. The opening in the ship is the original thing named; the verbs are built on it.
這個名詞是從中古法文 escoutille（艙口）進入英文的，更早可能連到古諾斯語 skaut（布或帆的角），或西班牙文 escotilla。最先被命名的就是船上那個開口，動詞的用法都是架在它上面長出來的。
Wiktionary etymology 2 as supplied in this packet (kaikki:3f6f69a190036ae4:545208539 / :545221878)
From the picture
自己把船弄沉
從「開一個洞」走到「開很多洞」：同樣的動作做到底，船就進水沉下去。
verb · C1
To sink a ship on purpose, by cutting holes in it or by letting the sea into it some other way. It is usually done by the ship's own crew or owner, often so that an enemy cannot take the ship and use it.
鑿沉（船）
讓計畫沉掉
把沉船的畫面搬離水面：受詞換成計畫，結局一樣是沉了、撈不回來。
verb · C1
To ruin a plan, a deal, or someone's chance of success, usually with one action or event that stops it for good. The source marks this use as American English and says it is especially common in news reports.
使告吹；搞砸（計畫）
noun · C2
A small opening with a cover, cut into the deck or side of a ship, or into the roof or ceiling of a building, that a person can climb through. On a ship it is also used to let water drain off an open deck.
小艙口；屋頂出入口