Sentence:  His next major work , completed in 1892 , was a long fantastic epic in prose , entitled Hans Alienus , which Professor Bo ^ o ^ k describes as a monument on the <WSD>grave</WSD> of his carefree and indolent youth . 
Meaning of the word marked with <WSD> tags:  a place for the burial of a corpse (especially beneath the ground and marked by a tombstone)