gr? "grave, ditch", from Proto Germanic
*graban (confer O.S. graf, O.Fris. gref, Old High German
grab "grave, tomb;" Old Norse
gr? "cave", Gothic graba "ditch"), from PIE base *ghrebh-/*ghrobh- "to dig, to scratch, to scrape" (confer Old Church Slavonic
grobu "grave, tomb"); related to grafan "to dig" (see grave (v.)). From Middle Ages to 17c., they were temporary, crudely marked repositories from which the bones were removed to ossuaries after some years and the grave used for a fresh burial. "Perpetual graves" became common from c.1650. To make (someone) turn in his grave "behave in some way that would have offended the dead person" is first recorded 1888. Graveyard shift "late-night work" is c.1907, from earlier nautical term, in reference to the loneliness of after-hours work.