Bisto is a British gravy powder: you mix it with hot water and it turns into brown gravy to pour over meat, sausages, and potatoes. In Britain it is the gravy many families grew up with, so the brand name often stands for the gravy itself, the way a famous product can become the everyday word. The old advertisements said “Aah! Bisto!” — that “aah” is the happy sound you make when the smell hits you — and they showed two children, the Bisto Kids, with their noses in the air. You will meet this in British stories, quizzes, and nostalgia more than in a shop in Taiwan. It is not the general English word for gravy; it is a brand. People do not use it as a verb, and they do not use it for just any sauce.

Bisto（英國肉汁粉品牌）。台灣幾乎沒人這樣叫；不是普通名詞「肉汁」。