真的長出來的小硬塊
這一層就是核心畫面本身，差別只在於長在誰身上。
noun · B1
A small, hard lump that grows on your skin, most often on the hands or the feet. It is caused by a virus, so it can spread by touch, and a doctor can remove it.
疣
核心畫面
A small hard bump that has come up on skin that was smooth before. It is not a mark you can wipe off; it stands up, it is firm, and it draws the eye to exactly the place you would rather nobody looked. Hold that picture and the rest of the word follows: the same bump on a toad or a pumpkin, the same unwelcome little lump on a plan, and finally a promise to show something with its bumps left in.
wart 可以想成本來平滑的皮膚上，冒出了一顆小小的硬塊。它擦不掉，是真的凸起來的；按下去硬硬的，而且偏偏就長在你最…更多收起
wart 可以想成本來平滑的皮膚上，冒出了一顆小小的硬塊。它擦不掉，是真的凸起來的；按下去硬硬的，而且偏偏就長在你最不希望別人看的地方。把這個畫面握住，後面幾個意思就順了：同樣的凸起長到蟾蜍或南瓜上，同樣一顆不討喜的小東西長在一份計畫上，最後變成一句話——這次連那些凸起都不修掉，全部給你看。From the word’s history
Wart goes back to Old English wearte and to the same Germanic word that gives German Warze and Dutch wrat. The meaning has hardly moved: a small raised lump on the skin.
wart 可以追到古英語的 wearte，再往上是日耳曼語族的同一個字；德文的 Warze、荷蘭文的 wrat、瑞典文的 vårta 都是它的親戚。難得的是這個字的意思幾乎沒有變過，一直就是皮膚上凸起的小硬塊，所以核心畫面不用靠推測。
Wiktionary etymology for wart: "From Middle English warte, werte, from Old English wearte, from Proto-West Germanic *wartā... Cognate with Dutch wrat, German Warze, Swedish vårta" (kaikki:3f6f69a190036ae4:363908206)
Two branches
比喻的那一顆：看得見的小缺點
把那顆凸起從皮膚搬到一件本來還不錯的事情上：東西沒壞，只是有一處不好看。
noun · C1
A small ugly fault in something that is otherwise good — a flaw you would rather not have to look at.
小瑕疵；不好看的缺點