One way to hold this word: a dose that quietens you down. Start with the small measure of medicine handed to someone who cannot settle — it does not fix anything, it just makes the noise stop. Once you can see that dose, the rest of the entry is the same dose handed over in other forms: as a sentence that soothes and answers nothing, or as a person whose whole conversation has that effect.
From the word’s history
The supplied source builds the word from brom- plus -ide, the ending English uses for such compounds, and says outright that the figurative sense extends the medicating sense through the idea of pacifying or placating. It also credits the 'dull person' use to the American writer Gelett Burgess.
來源說這個字是 brom-（溴）加化學字尾 -ide 組成的。來源也直接寫明，比喻的用法是從「用藥安撫」那一層延伸出來的。另外，用來指「無趣的人」，來源記在美國作家 Gelett Burgess 名下。
Wiktionary, "bromide"
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