English is the most creative, changeable and imaginative of languages. Some words are invented to meet temporary needs and are quickly discarded; others carry meanings hundreds of years old. Language fascinates us, and we spend a lot of time playing with it, concocting everything from puns, riddles and secret languages to wonderful prose and poetry. We also worry about it a great deal, looking up and checking words in dictionaries and usage guides, occasionally arguing about definitions. This book celebrates our capacity to play with language, as well as examining the ways we use it: in slang...