One way to hold this word: something is keeping a space open inside itself, and then it stops being able to. Whatever was outside pushes in, and the thing drops into its own middle. Nothing flies at you. What is left is smaller than what you started with, and it happens in one breath.
可以想成：有個東西正撐著自己裡面的一塊空間，然後它撐不住了。外面的力量壓進來，它就往自己的中間掉下去。東西不會朝你飛過來，反而整個縮小。而且這一切幾乎是一瞬間發生的。這個畫面裡最要緊的就是方向：往內，不是往外。
From the word’s history
The packet's source says the verb is a back-formation from the noun implosion: the name of the event came first, and the verb was made from it.
packet 的來源說 implode 是從名詞 implosion 逆推出來的動詞。先有「內爆」這個現象的名稱，才有這個動作說法。這也解釋了為什麼它的意思這麼專注在同一個畫面上：它本來就是為了這個現象而生的字。
Wiktionary, "implode"
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