I’m pretty sure back in the days of real Christmas trees, there was plenty of actual tree trimming going on. If you just went out in the woods and got your tree, and not from a tree lot, you weren’t going to find a perfectly shaped tree. You would have needed to trim some of the branches to make it pretty looking. But yeah, today its usually mean to decorate, although I’m sure there are people who still actually trim their tree… and I really don’t ever hear anyone talking about trimming the tree. Most people say they’re going to decorate their tree… Or simply get out the Christmas tree. Just as no one actually hangs up their phone anymore. We still say it even though a majority of people simply end the call and put their phone in their pocket. Not many actually hang up the phone when they’re done with a call.