What is "unweaving"

Usage examples of "unweaving".

Stones swayed as if whatever spell had set them in place was at this moment unweaving itself, and Zacharias shrieked, flinging up his hands to protect himself, although mere flesh could not protect him against stone.

I folded the lengthwise edge of the blanket over once, cut two holes midway down, about a foot apart, and linked the holes with a piece of string, which I made by unweaving a length of rope.