會灼傷人的話
把瓶子裡的東西換成語言：一樣是潑出去，一樣是落在誰身上就傷誰。來源直接把這個意思標為從酸延伸而來。
noun · C1
Very cruel and angry language meant to hurt someone. Used about what is said or written when the attack is personal and full of hate rather than reasoned argument.
惡毒的言語攻擊
核心畫面
A thick glass bottle on a high shelf, holding a clear liquid that burns whatever it touches. That bottle is where the word starts. Everything else the word does today is that liquid, thrown in words instead.
可以想成高架子上的一只厚玻璃瓶，裡面裝著一種碰到什麼就灼傷什麼的透明液體。那只瓶子是這個字的起點。今天這個字在做的事…更多收起
可以想成高架子上的一只厚玻璃瓶，裡面裝著一種碰到什麼就灼傷什麼的透明液體。那只瓶子是這個字的起點。今天這個字在做的事，一種想法是把瓶裡的東西換成語言潑出去——落在人身上，一樣會留下傷。From the word’s history
The packet traces vitriol through Old French to Medieval Latin vitriolum, from vitrum, glass: the sulphate crystals look glassy. The learner dictionary marks the acid sense as old use, and the other source marks the abusive-language sense as an extension of it — so the burning came first and the words came after.
來源把 vitriol 追到中世紀拉丁文 vitriolum，字根 vitrum 是「玻璃」——那些硫酸鹽結晶看起來亮得像玻璃。學習型字典把酸的意思標成舊用法，另一份把「惡毒的話」標成由它延伸而來。所以順序是清楚的：先有會灼傷的東西，後來才有會灼傷人的話。
Wiktionary and LDOCE entries supplied in the evidence packet (source_ref kaikki:3f6f69a190036ae4:963946259; LDOCE marks sense 2 'old use' and Wiktionary marks the abusive sense 'by extension').
From the picture
Also in this word
noun · C2
An old name for sulphuric acid, a very strong acid that burns what it touches. You meet this meaning mostly in old books and old chemistry writing, often in the phrase 'oil of vitriol'.
（舊稱）硫酸