Green's Dictionary of Slang Green’s Dictionary of Slang is the largest historical dictionary of English slang. Written by Jonathon Green over 17 years from 1993, the main focus of the dictionary is the coverage of over 500 years of slang from c.1500 onwards. On this website the dictionary is now available in updated online form for the first time, complete with advanced search tools enabling search by definition and history, and an expanded bibliography of slang sources from the early modern period to the present day. Since the print edition, nearly 60,000 quotations have been added, supporting 5,000 new senses in 2,500 new entries and sub-entries, of which around half are new slang terms from the last five years.