Emicate
I love this one because it is an old word that died off, then got a new life with a different-ish meaning.
So when you are working with iron, like a blacksmith would, and you heat it red-hot and start hitting it with a hammer, tiny little particles fly off of the main piece. They emicate. I found this word in the OED in the boss' office one weekend (I don't think he ever cracked the spine on any of the books,, but they looked impressive on the shelf. For a long time whenever I came upon a dictionary, I would see if this word was in it, and most always, it wasn't.
When I was in the retirement plan industry, I used this word in a letter to describe the process of employees who started to leave a company after it was acquired and the new owners cut pay, increased hours, and generally made it a bad place to work - turning up the pressure and heat. One of the lawyers copied on that letter called me to talk about my use of the word - we were off and on friends for a few years because of that.
Now, it's in dictionaries again, generally with the meaning "sparkle", you get the idea, but it's not as much fun as the story that goes with the original meaning.