quitch

To shake (something); to stir, move.

To stir; to move.

With a strong yron chaine and coller bound, / That once he could not move, nor quich at all […].

To flinch; shrink.

Elymus repens, couch grass (a species of grass, often considered a weed)

we found the bones and ashes half mortered unto the sand and sides of the Urne; and some long roots of Quich, or Dogs-grass wreathed about the bones.