"Ron was great," said Tonks warmly, relinquishing her hold on Lupin.
Harry fell to his knees, relinquished Dobby’s hand, and attempted to lower Griphook gently to the ground.
The goblin astride him, Harry dived and caught it, and although he could feel it scalding his flesh he did not relinquish it, even while countless Hufflepuff cups burst from his fist, raining down upon him as the entrance of the vault opened up again and he found himself sliding uncontrollably on an expanding ava-lanche of fiery gold and silver that bore him, Ron, Hermione into the outer chamber.
Then Griphook relinquished him, clapped his hands together, and said, "So.
There are no more uses of "relinquish" in the book.
Show samples from other sources
I’ve relinquished—or been relieved of—my seat at the Hall family table.
Gayle Forman -- Where She Went
I vowed that I would never relinquish my sense of self again, to anything or anyone.