Picture something that will not stay where you put it. You tip the spoon and it slides off; you leave it on the plate and it spreads out to the edge. English has one verb for what a liquid does when it behaves like this — it runs — and runny is simply the adjective for anything doing it. The word carries a quiet expectation with it: this thing should have been thicker, or should have stayed inside.
runny 可以想成「留不住、會自己跑掉」的樣子。湯匙一斜它就滑下去，放在盤子上它會攤開到邊緣。英文把液體這種動作叫 run，runny 就是形容正在這樣做的東西。這個字背後通常藏著一個期待：它本來應該再稠一點，或者本來應該待在裡面不要出來。
From the word’s history
From run plus the ending -y, so literally having the quality of running — of flowing.
來自 run 加上 -y。run 除了人在跑，也是英文形容液體流動的動詞，所以 runny 字面就是「帶有流動性質的」。兩個意思都直接從這裡長出來。
Wiktionary entry for runny (packet evidence, source_ref kaikki:3f6f69a190036ae4:1049455218:8672): From run + -y.
登入就可以看每一支怎麼連回核心畫面。