You must buy this book! Why? Because you will find out things you never knew, like that in Britain, "puke" means to vomit. "Piece of cake" means easy, "posh" means high class, "put a sock in it" means shut-up. This book is littered with words and phrases that mean exactly the same thing in either American or British English. I e-mailed the author, who responded politely, but basically said the book is just fine as it is. The book is useful for reference and enjoyable for browsing, but is flawed by its inclusion of entries that do not belong.