Picture one bag of sand on the ground. It is heavy for its size, it stays exactly where you drop it, and it settles into whatever is under it and fills the gap. Pick it up and you feel the weight before you are ready for it. Those two things — it blocks, and it is heavier than it looks — are what the word keeps carrying when it leaves the flood and moves into meetings and games.
可以想成地上放著一袋沙。體積不大但很重，丟在哪就待在哪，而且會順著地面塌下去，把縫填滿。要把它抬起來的時候，那個重量常常比你預期的早一步壓到手上。「擋住」和「比看起來更重」這兩件事，就是這個字後來離開水災現場、跑進會議室和比賽場時，一路帶著走的東西。
From the word’s history
Simply sand plus bag. The compound says exactly what the thing is, and every later use still leans on that object.
就是 sand（沙）加 bag（袋子）拼起來，字面跟實物完全一樣。值得注意的是後面那些抽象用法都還靠著這個實物在運作：擋住、壓著、突然變重。
Wiktionary entry for sandbag, packet source_ref kaikki:3f6f69a190036ae4:1174054789 — 「From sand + bag.」
登入就可以看每一支怎麼連回核心畫面。