Sentence:  Then the conceit of this inconstant stay / Sets you most rich in youth before my sight, / Where wasteful Time debateth with Decay, / To change your day of youth to sullied night; / And all in war with Time for love of you, / As he takes from you, I <WSD>engraft</WSD> you new. 
Meaning of the word marked with <WSD> tags:  To fix firmly into place