History is full of silver-tongued scoundrels. So if you find yourself in a 19th-century battle of wits, best not to bring a dagger to a musket fight. The solution for any quantum leaper: Jonathon Green’s new book, Green’s Dictionary of Slang, a 6,200-page lexicon spanning more than half a millennium. Try one of these gems out as you sail through time, you beef-witted dunnigan.