The phrase "doing a number on" refers to causing damage or harm to someone or something. Antonyms for this phrase include restoring, repairing, fixing, healing, and mending. Instead of doing a number on someone or something, we can work towards making things better by offering help, support, and kindness. By using positive language and actions, we can counteract the negative effects of "doing a number on" and create a more harmonious and peaceful environment. It's important to remember that our words and actions have the power to either uplift or deflate those around us, so let's strive to do the former.