The word "in-folds" is a term used for the act of folding something inwardly. Its antonyms, therefore, could be words that suggest the opposite action - i.e. unfolding, or unrolling. Unfolding, in this case, refers to the stretching out or opening up of something that has been previously folded. Other antonyms of in-folds could include spreading, expanding, or uncurling, all of which connote the idea of a surface being extended, stretched out, or made to occupy more space. Ultimately, the antonyms of in-folds are words that suggest a movement away from the concept of inwardness and confinement, towards openness and expansion.