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The free Green's Dictionary of Slang celebrates 500 years of'vulgar tongue.' Breakthroughs, discoveries, and DIY tips sent six days a week. While some terms or phrases may linger for centuries, most of today's slang terminology is more current. That often makes it difficult to keep up with the times, let alone understand casual communications of the past. That's where Jonathon Green came to the rescue. In 1993, Green started compiling 500 years of English slang by sifting through mountains of primary sources.