"covering every part," 1859, from the adverbial phrase; see all + over (adv.). As a noun, by 1838 as the trade name for a button, etc., gilded on both the upper and under sides, as distinguished from a top, plated on the upper side only. All-overish "generally and indefinitely indisposed" is from 1820, on the notion of "affecting the whole system." Related: All-overishness.
updated on September 17, 2022