Book excerpt: From abaft to Zulu, including terms as new as bowrider and as old as starboard, here is the language of pleasure boating--clearly defined terms that today's sailors and powerboaters rely on to make their way safely and happily upon America's waters. Families of related terms are grouped together in special sections. QUIZ: What do the following phrases mean: head up, harden up, come up, round up, freshen your wind, sharpen up, sharpen your wind, heat it up? ANSWER: The same thing: steer closer to the wind.