Entries linking to everybody
"each, considered indefinitely as a unitary part of an aggregate; all, of a collective or aggregate number, taken one by one;" early 13c., contraction of Old English æfre ælc "each of a group," literally "ever each" (Chaucer's everich), from each with ever added before it for emphasis. The word still is felt to want emphasis; as in Modern English every last ..., every single ..., etc.
Also a pronoun to Chaucer, Shakespeare, Spenser, "each of any number of persons or things; every one." Compare everybody, everything, etc. The word everywhen is attested from 1843 but never caught on; neither did everyhow (1837).
Every now and then "repeatedly, at short intervals" is from 1660s. Every once in a while, U.S. colloquial, "now and then, from time to time," is attested from 1814 (Bartlett calls it "A singular though very common expression"). Slang phrase every Tom, Dick, and Harry "every man, everyone" dates from at least 1723, from the common English given names.
That is to ſay, they affirm, that once upon a Time (tho' they never yet could tell when) all Mankind were upon a Level, and that there was no ſuch Thing as Government in the World; and that Tom, Dick, and Harry, ay, every individual Man, Woman, and Child, had a Right to the whole World. [Charles Leslie, "A Short and Eaſie Method with the Deists," London, 1723]
Old English bodig "trunk of a man or beast, physical structure of a human or animal; material frame, material existence of a human; main or principal part of anything," related to Old High German botah, but otherwise of unknown origin. Not elsewhere in Germanic, and the word has died out in German (replaced by Leib, originally "life," and Körper, from Latin), "but in English body remains as a great and important word" [OED].
Extension to "a person, a human being" is from c. 1300. Meaning "main part" of anything was in late Old English, hence its use in reference to vehicles (1520s). From 1580s as "part of the dress which covers the body." From 1590s as "main part of a group, any number of individuals spoken of collectively." From 1660s as "main portion of a document." Contrasted with soul at least since mid-13c. Meaning "corpse" ("dead body") is from c. 1200. Transferred to matter generally in Middle English (as in heavenly body, late 14c.).
Body politic "the nation, the state, whole body of people living under an organized government" first recorded late 15c., with French word order. Body image was coined 1934. Body count "number of enemy killed in battle or otherwise" is from 1968, from the Vietnam War. Body language is attested from 1967, perhaps from French langage corporel (1966). Body-snatcher "one who secretly disinters the bodies of the recently dead for dissection" is from 1834. Phrase over my dead body attested by 1833.