"Cat's Cradle" is a phrase used to describe a children's string game. As it is just one term, it does not strictly have antonyms. However, you could use opposing words to describe elements of the game, such as "tension" and "relaxation" when referring to the tightness of the strings, or "order" and "chaos" when describing the pattern created by the string. Another possibility could be to use antonyms to describe the opposite action of playing the game altogether, such as "exercise" and "rest" or "activity" and "inactivity." Ultimately, while there are no direct antonyms for "cat's cradle," you could use opposite words to describe things related to the game.