This will be my last post before Christmas, as I am going to Munich tomorrow to visit my daughter for the holiday. I thought I'd do a quick post on the origin and history of the word merry, but wow! what an interesting story! I've been following up references for the past couple of hours.
Merry is one of the oldest words in English, and at various times has meant 'causing pleasure', 'pleasing', 'pleasant', 'producing a sweet sound', 'pleasing to behold', 'fragrant', 'amusing', 'brightly coloured', 'festive', 'jolly','tipsy' and 'witty'. It's an unusual word because there aren't any similar words in other Germanic languages; the nearest is the Middle Dutch mergelijc, which also means 'pleasant'. It is ultimately related to the Old High German murg, which means 'short' and this in turn comes from an original Proto Indo-European (ie the common ancestor of all Indo-European languages) root *meghru or *mrghu, which also means 'short'.
So what have 'short' and 'jolly' or 'pleasing' got to to with one another? Maybe, it's that doing something pleasant makes the time pass more quickly, or seem shorter. There is an obsolete German word Kurzweile (literally 'short time') which refers to a pleasant pastime. The opposite Langeweile (literally 'long time') is in modern German dictionaries and means 'boredom'. Indeed, the word pastime in English has a similar sense ie the time passes quickly because it is enjoyable.
So, Merry Christmas everyone. I'll be back at the beginning of next week.