Read the passage from Hamlet, Act I, Scene v.

Ghost: I could a tale unfold whose lightest word
Would harrow up thy soul, freeze thy young blood,
Make thy two eyes, like stars, start from their spheres,
Thy knotted and combined locks to part,
And each particular hair to stand an end ...

Based on context, what is the meaning of harrow up?

vastly puzzle
highly please
greatly disturb
deeply enlighten