The antonyms for the word "over-supplying" can be divided into two categories: positive and negative. The positive antonyms for over-supplying are under-supplying, withholding, and restricting. These terms imply a more conservative approach to satisfying demand, perhaps in order to balance the market, control prices, or prevent waste. On the other hand, the negative antonyms for over-supplying are over-demanding, hoarding, and monopolizing. These terms suggest a selfish or greedy behavior, in which an individual or a group tries to create scarcity, inflate prices or gain power over the supply chain. Depending on the context, the choice of antonym can have different connotations and implications.