meed > reward
4 Of him that slew Sansfoy with bloody knife;
knife > sword
5 Henceforth his ghost, freed from repining strife,
ghost > spirit, soul repining > fretting, fretful
6 In peace may pass over Lethe Lake,
Lethe > (A river in hell; those who drink from it lose all memory of their former life and become purified; see SC, gloss to "March", Aen. 6.745-51, PL 2.604)
7 When mourning altars, purged with enemy's life,
purged > purified
8 The black infernal Furies do aslake: