Thirst, but for blood. Not the ordinary wish for something, but the dry-throated kind that has to be satisfied — and what it is pointed at is killing itself.
可以想成「對血口渴」這個畫面：thirsty 不是普通的想要，是喉嚨發乾、非喝到不可的那種渴。把渴的對象換成血，整個字就立起來了——它講的不是氣到想吵架，而是對流血這件事本身有胃口。這個組合在荷蘭文 bloeddorstig、德文 blutdürstig 裡是同一套，看得出它拼得多直接。
From the word’s history
The word is simply blood plus thirsty, with no detour, which is why the picture inside it is still completely visible.
這個字就是 blood 加 thirsty 拼起來的，中間沒有轉彎。所以它的畫面到今天還看得一清二楚，不需要考古就能讀出來。
Wiktionary, "bloodthirsty"
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