The antonyms for the phrase "numbers up" may include "numbers down," "decrease," "reduce," "diminish," "subside," "lessen," "shrink," "weaken," "drop," or "minimize." These antonyms convey the opposite meaning of increasing or improving the number or quantity of something. Instead, they signify a reduction or decrease in numbers, proportions, or quantities. For instance, if a company's profits are down, it means that the numbers have decreased compared to the previous year. Similarly, if the temperature drops, it means that the numbers on the thermometer have reduced. Using antonyms can help to create a variety of perspectives and add depth to writing.