The word "intertangle" refers to the action of knotting or intertwining things together. Its antonyms are "untangle," "unravel," "separate," "disentangle," "disentwine," and "unweave."
To "untangle" means to remove knots or entanglements, to "unravel" means to undo something that has been wound up, and to "separate" means to divide or disconnect things from each other.
On the other hand, "disentangle" means to free something that is entangled or twisted together, to "disentwine" means to separate or disengage twisted strands, while "unweave" means to undo a woven structure to separate its components.