Languages change over time. No matter how hard we try to control and regulate them, they exist in a state of endless metamorphosis. This does not mean, though, that we should simply stand by and watch as language devolves into nonsense. What should we do, then? Recognizing the inevitability of change is a given, of course. But we must also navigate the delicate line between the pull of popular trends and the urge to cling blindly to the ways of the past. The ideal balance, Professor Nakanishi argues in this book, lies in being "one step behind the times," which is the best approach for wielding.