Phrases, Sayings, Expressions & Idioms
Current American Idioms - http://www.pride-unlimited.com/probono/idioms1.html
American Phrases and sayings at The Phrase Finder - http://www.phrases.org.uk/meanings/phrases-and-sayings-list.html
http://www.krysstal.com/wordname.html - The Origin of Words and Names. The English language has developed from an Anglo-Saxon base of common words: household words, parts of the body, common animals, natural elements, most pronouns, prepositions, conjunctions and auxiliary verbs. Other modern words in English have developed from five sources. These are discussed here and much more.
http://www.localhistories.org/sayings.html - The Origin of some old sayings by Tim Lambert.
http://www.etymonline.com/ - Online Etymology Dictionary. This is a map of the wheel-ruts of modern English. Etymologies are not definitions; they're explanations of what our words meant and how they sounded 600 or 2,000 years ago.