Antonyms for the phrase "more such-and-such" would generally involve the idea of having less of something. For instance, if "more joy" is the phrase, the antonym would be "less joy." Similarly, if "more money" is the phrase, the antonym would be "less money." Other antonyms could include words like "decrease," "reduce," "minimize," or "diminish." These words imply a decrease in quantity, quality or other characteristics. Conversely, the word "more" suggests an increase or addition. Therefore, when someone uses "more such-and-such," they are expressing a desire for an increase in that quality or characteristic.