One way to hold this word: a strong beam thrown forward from the front of a vehicle, cutting a bright path through the dark. The lamp sits at the very front, the light travels ahead of the car, and anything standing in that beam is suddenly lit up and completely visible.
headlight 的畫面可以想成：一道從車頭往前打出去的強光，在黑暗裡切出一條亮路。燈裝在車子最前面，光走在車子前面，而任何站進那道光裡的東西，會突然整個被照亮、無處可躲。這個字有時指燈具本身，有時指那道光；至於「被照住的那一瞬間會發生什麼事」，也是從同一個畫面長出來的。
From the word’s history
Wiktionary records the word as a compound of head + light: the lamp on the front (the 'head') of a vehicle.
Wiktionary 記的來源是 head + light 的組合：裝在車子「頭」上的燈。這條線索直接對上畫面裡的位置——在最前面，朝前打光。
Wiktionary (kaikki extract), headlight, etymology: "From head + light."
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