Think of rerun as feeding the same thing through a second time. The tape, the race, the test, the set of steps: none of it is changed, and none of it is . It simply starts at the beginning again, and you wait to see what comes out this time.
rerun 可以想成「同一卷帶子再放一次」。東西沒有改，順序也沒有改。就是從頭再走一遍，然後看看這次跑出什麼。re- 是「再一次」，run 是「跑過去、放一遍」。兩個合起來，就是這個畫面。不管是節目、比賽、檢驗還是程式，只要是「原封不動再來一次」，都可以掛在這個字上。
From the word’s history
Wiktionary gives the formation directly: rerun is re- plus run. The prefix re- means again, and run already covers making something go through from start to finish, so the modern core needs no extra story.
Wiktionary 直接寫出這個字的組成：rerun 就是 re- 加 run。re- 是「再一次」，而 run 本身就有「讓一件事從頭跑到尾」的意思。所以現在的核心畫面不需要額外的故事，字面上就是「再跑一遍」。
Wiktionary entry for rerun (evidence packet source_ref kaikki:3f6f69a190036ae4:205733697:22536, etymology_text: From re- + run)
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