The antonyms for the word "enlarges up on" could be "reduces," "shrinks," "contracts," "condenses," "deflates," or "decreases." These words denote the opposite of "enlarges up on," which describes an increase in size or dimension. In practical terms, one might say that a balloon "enlarges up on" being inflated, while it "deflates" when released. Alternatively, a picture frame might "enlarge up on" being expanded, while it "shrinks" when compressed. Understanding antonyms like these can help us to communicate more precisely and clearly when describing size or movement.