Meyer mentions Uber Greifen several times.
Ubergreiffen
Ubergreiffen ist also, Hauw von deiner Rechten zu seiner Obern Lincken Blöß, im Hauw aber greiff mit den Fingern uber das kreuz oder Schilt herauß, jedoch so behalt den Daumen an dem Hefft, unod? mit der Lincken Handt erheb den Knopff, und schlag in mit hangeter Klingen uber oder hinder seiner versatzung auff den Kopff.
Overgripping
Overgripping is thus: Strike from your right to his upper left opening, however in the strike grip with the fingers out over the cross or hilt while holding the thumb on the haft, then with the left hand raise the pommel and slash in with hanging blade over or behind his displacement to the head.
He is refering of course to how one grips ones own blade here, but he also describes it for this technique. (upper right figures)
Something we called the Roof or shield in Kali/Escrima.
This is a controling or gripping technique I think was used to imobilize the opponents weapon so you could get your strike in. It could also be done deeper as a disarm something we called the snake in Kali/Escrima.
So I use over gripping to refer to my own gripping over my quillons and my gripping over my own weapon to grasp the opponents quillons or hilt.