I've just encountered this title of BBC news page on Facebook and then looked for the meaning in the dictionary but I couldn't tell the meaning of it in this context.
1 Answer
It's a mistake. News articles don't begin with "But". Someone evidently thought it looked better with the headline below the article. Originally it may have looked like this:
UK virus infections back to September levels
But the World Health Organization warned that Covid cases around the world are continuing to increase at a "worrying rate".
When the text is arranged like this the word **But** makes sense. There is good news BUT there is also bad news.
(By the way, "warned" should be either "warns" or "has warned.")
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1This is a somewhat common way to comment on something on social media (or at least Twitter), but that doesn't really make sense for one's own content, especially not when sharing it for the first time. Commented Apr 17, 2021 at 9:41