真的裝藥的那個盒子
這一家只有一個意思，而且它就是核心畫面本身：拿在手上、裝著藥丸的小圓盒。
noun · B1
A small box, usually round and shallow, that you keep pills in.
藥盒
核心畫面
Picture one small object: a low, round container with a flat lid, the size of your palm. It is wider than it is tall, it has no handle and no shape of its own beyond that squat circle, and you can set it down anywhere. Hold that picture. One meaning is the object itself, with pills inside. The other two can be thought of as the same squat circle at other sizes — poured in concrete and set on the ground, or turned over and placed on a head.
pillbox 的核心畫面可以想成一個東西：一個矮矮圓圓、蓋子平平的小盒子，大概一個手掌大。它寬大於高，沒有把手，就…更多收起
pillbox 的核心畫面可以想成一個東西：一個矮矮圓圓、蓋子平平的小盒子，大概一個手掌大。它寬大於高，沒有把手，就是一個蹲著的圓。先把這個畫面記住。第一個意思就是這個東西本身，裡面裝藥。另外兩個意思，可以想成是同一個形狀換了尺寸——用水泥灌出來蹲在地上，或是翻過來放在頭頂上。From the word’s history
Wiktionary records the word simply as pill + box: the box that pills go in. The other two meanings are linked here by shape only, as a way to remember them, not as a claim about how they came about.
Wiktionary 記的來源很單純：pill（藥丸）+ box（盒子），就是裝藥丸的盒子。至於碉堡和帽子，這裡只是把「形狀很像」當成幫助記憶的線索，不是在說它們是從藥盒一路演變出來的歷史。
Wiktionary (kaikki) pillbox noun entry: From pill + box. (source_ref kaikki:3f6f69a190036ae4:1485521456:12631)
Two branches
借這個形狀來稱呼的東西
這一家的東西跟藥完全無關，共同點只有外型：矮、圓、頂平。把核心那個小盒子放大成建築，或縮小戴在頭上，就是這兩個意思的樣子。
noun · B2
A small, low, very strong building, usually round and made of thick concrete, built as a defence. It has narrow openings in the walls, so soldiers inside can watch and fire a gun out while staying under cover.
碉堡