The word is the verb phrase run down turned into a thing. One loose picture holds the family: moving along something from the top to the bottom. Go down a list and you end with a summary; let a business go down and down and you end with a shrinking; chase a runner down between two bases and you end with him caught.
這個字是動詞片語 run down 直接變成的名詞，所以它的畫面也是動作留下來的東西。一種想法是：沿著某樣東西，從頭一路跑到尾。把一張清單從上跑到下，跑完就是一份重點說明。讓一個廠一年一年往下掉，掉出來的就是規模縮減。在兩個壘之間把跑者追著跑，追到底就是夾殺。三個意思不是三個字，而是同一個「一路跑到底」的動作，落在不同的東西上。
From the word’s history
Wiktionary records rundown as a deverbal noun from the phrasal verb run down — the noun is simply the action turned into a thing.
來源記載 rundown 是 run down 這個動詞片語直接轉成的名詞（所謂 deverbal）。也就是說，這個名詞本身就是那個動作被當成一樣東西來講，所以它的每個意思裡都還看得到「跑過去」這個動作。
Wiktionary entries supplied in this packet (kaikki:3f6f69a190036ae4:901901639 and :901910832), etymology_text field: "Deverbal from run down."
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