Picture a small insect that has got into an old book and is eating its way straight through it — paper, glue, page after page, until there is a neat hole running from the front cover to the back. That is where the word starts, and it is the whole word. Move the picture onto a person and nothing has to change: someone who goes through books that way, one after another, without stopping, is a bookworm too.
可以想成一隻鑽進舊書裡的小蟲，紙、膠、一頁一頁地吃過去，最後在書上留下一個從封面直穿到封底的小洞。這個字就是從這裡開始的，而且整個字只有這一個畫面。把畫面換到人身上，什麼都不用改：一本接一本、停不下來地讀完的人，也是 bookworm。
From the word’s history
Wiktionary gives it plainly as book + worm.
來源資料把這個字記成 book 加 worm 的組合。字面就是「書裡的蟲」，兩個意思都直接從這裡出來。
packet wiktionary etymology_text, source_ref kaikki:3f6f69a190036ae4:537635334:31016
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