Cutting it out means to stop doing something, particularly when it is annoying or irritating to others. The most commonly used antonyms for cutting it out are phrases that suggest continuing with the action. For instance, you could say "keep doing it" or "carry on." Additionally, you can use phrases that encourage or support the action, such as "don't stop" or "go on." You could also use phrases that imply ignoring the person's request to stop, such as "plow ahead" or "push through." These antonyms suggest a continuation of the behavior that the person wants you to stop.