Now, I have to hand it to Dictionary.com, tergiversate is a great word. When I was in third form, I compiled a list of new and cool words as I encountered them in my reading, and I still remember that one of them was tergiversate. (Two others were haruspex and trireme. I must have been reading ancient history.)
Dictionary.com has chosen tergiversate as word of the year, eschewing neologisms and, as Jay Schwartz, Dictionary.com's Head of Content told The Huffington Post: "We think that it's immensely rewarding to find existing words that capture a precise experience, and this year, tumult has been the norm rather than the exception."
Oh--what does it mean? Flip-flop, equivocate, turn your back. Tergiversate, o man, foreswear thy foolish ways!