Both informative and fun to read, the Dictionary contains both definitions and word history for ALL levels of colloquial English. Unlike other dictionaries of the sort, it includes even words that were colloquial or slang once.
Before I read it I didn't realise that history of words could be so entertaining. E. Partridge has presented a hoard of entertaining information in an entertaining way.
Even if you know all the English there is to know, the Dictionary is full of word stories you might still like to read. Do you know how the organ representing human courage over the centuries went all the way from heart to pluck, down to guts and below?
I haven't checked the facts for a few years, but it still may be the largest collection of slang and colloquial terms for ANY slanguage