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OneSearch is really what it's name implies, one place to search for many different kinds of sources, including; books, eBooks, academic articles, news articles, videos, and more!
From the website: "The Corpus of Contemporary American English (COCA) is the largest freely-available corpus of English, and the only large and balanced corpus of American English.
From the website: "The Corpus of Historical American English (COHA) is the largest structured corpus of historical English.
From the website: "Word origins not only shed light on their current meaning, but offer clues to their usage. Dictionary.com uses the comprehensive and authoritative etymologies from the Online Etymology Dictionary. This resource synthesizes some of most authentic documents of word history available, offering succinct and incisive information."
Find origin and first usage of selected English proverbs, phrases coined by Shakespeare, American phrases, and nautical and biblical phrases. Good website for getting ideas.
A blog about word and phrase origins with detailed, well-cited articles. Maintained by Dave Wilton, a doctoral candidate at the University of Toronto. Check out "The Big List" to see a list of all words & phrases, or use the search box.