Think of two dogs that have got hold of each other and will not let go: they spin, snap, and keep circling, each one trying to get behind the other. Everything this word covers is that one tangled, close-up scrap — even when the fighters are made of metal and are a thousand metres up.
可以想成兩隻狗咬住對方不放：牠們一直轉、一直換位置，誰都想繞到對方後面去。整個畫面的重點是「近」和「纏」，不是誰站在遠方出手。這個字所有的用法，都可以想成同一團扭打——只是後來打架的變成了金屬做的、飛在一千公尺高的東西。
From the word’s history
The word is simply dog + fight, so the animal picture is right there in its two halves.
這個字就是 dog（狗）加 fight（打架）兩個字拼起來，所以那個扭打的畫面本來就寫在字面上。飛機的用法是後來借過去的比喻，不是另一個來源。
Wiktionary, "dogfight"
登入就可以看每一支怎麼連回核心畫面。