six feet under

six feet under idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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