3 And eke the hag, with many a bitter threat,
eke > also
4 Still called upon to kill him in the place.
Still > Continuously upon > [upon Furor] in the place > there; on the spot, right away
5 With whose reproach and odious menace 6 The knight, emboiling in his haughty heart,
emboiling > boiling with rage (SUS)
7 Knit all his forces, and gan soon unbrace
gan soon unbrace > did immediately loosen
8 His grasping hold: so lightly did upstart,
lightly > quickly, lightly upstart > get up