4 And of each shade that did itself present;
shade > shadow
5 For still she feared to be overhent
still > continually overhent > overtaken (cf. 304.49:8)
6 Of that vile hag or her uncivil son:
Of > By uncivil > uncivilized, barbaric
7 Who, when too late awaking, well they kenned
kenned > discovered
8 That their fair guest was gone, they both began 9 To make exceeding moan, as they had been undone.
moan > lamentation as > [as if]