The battle with Grendel

When Grendel enters Heorot his intent is to kill and consume as many of its inhabitants as possible. Unfortunately, he doesn't know of Beowulf's arrival, and Beowulf is waiting for him. When Beowulf grabs onto Grendel's arm, he is taken by surprise and afraid.... people usually try to run from him..... not physically confront him. As Beowulf continues to hold on, jerking the shoulder in its socket, Grendel begins to yell, pulling away in an attempt to escape. When he is finally successful in jerking free.... he is also freed from his arm, which Beowulf holds in his hands.

What is the meaning of Ring Giver And Gold Giver?