![six feet under six feet under](https://www.tekportal.net/wp-content/uploads/2018/11/six-feet-under.jpg)
Dead and buried, as in No, you can’t read my diary—not until I’m six feet under. Although this expression alludes to what has long been the traditional depth of a grave, that is, approximately the same as the length of the coffin, it dates only from the mid-1900s.