The antonyms for "re-duces" can vary depending on the context of usage. If we consider "re-duces" in terms of weight or size reduction, some of the antonyms can be "increases," "expands," "enlarges," "augments," "extends," or "swells." On the other hand, if we consider "re-duces" in terms of change or transformation, some of the antonyms can be "maintains," "preserves," "upholds," "sustains," "retains," or "enhances.