We went to the cemetery to visit my aunt's 'grave'. [=to visit the place where my aunt's body is buried]
She took her secrets with her to the 'grave'. [=she died without telling anyone her secrets]
A hard life 'drove him to an early grave'. [=caused him to die when he was fairly young]
(..) I just can't know. I don't know what they do in that particular department, anyway. - Are you still a cop? - No! No! Swear on your mother's grave you're still not a cop? I am not a fucking cop! Are you gonna stop doing coke deals with your jerkoff fucking cousin? Yes. Yes, yes. (..)2006 The Departed