Collapse
When a knot or hitch changes form under strain and its parts rearrange; also called capsizing.
Shibari Study’s glossary defines collapse as a knot changing form when it is stressed or deformed, and gives capsizing as another name. General knotting uses capsizing in the same sense, for a knot whose parts rearrange, usually when particular ends are pulled in particular ways; Wikipedia notes that some knots capsize easily, even spontaneously, when used inappropriately. In rope bondage the word comes up in connection with cuffs: Shibari Study describes the hojo cuff as an inline single-column tie that does not collapse.