Over recent years, it has become very common for new words to enter our language and become part of the way we speak. Often these terms emerge on social media or from politics, but occasionally ideas from foreign climes will break through. The best of these words will get into the OED and then we know that they are here to stay. Unless you’ve been living in a bunker for the last twelve months, you can’t fail to have noticed the ascendancy of the latest of these new terms: Hygge (pronounced hoo-gah). But what is it?