Lyric discussion by jack_the_brat 

Cover art for The Unquiet Grave lyrics by Faith and the Muse

A man's lover dies, and he is devestated. He vows to sit by her grave and mourn her for a year and a day. After this time has passed, his dead lover appears to him. He wants to be with her again, but she tells him he must move on with hislife or it will not be long before he is in the ground with her.

It's not literally sitting by her grave, but mourning her everyday, not moving on with his life and accepting her death.

This is a very old ballad, and one of my favourite poems.