Guffipedia
Lucy Kellaway’s dictionary of business jargon and corporate nonsense
Upgrade
Translation into plain English You're fired
Perpetrator Anon US company reported by reader
Usage example "We are going to upgrade you with immediate effect. We are going to allow you to move on in order that you can you use your talents and skills more effectively and thus upgrade your career and opportunities."
Lucy’s commentary Winner, for sheer disingenuity, Best Term for Sacking People 2008.