The antonyms for "push one button" may vary depending on the context. However, some possible opposite phrases could be "multiple steps," "complicated process," or "manual operation." When we say "push one button," we infer that the task is quick, effortless, and automated. Therefore, its antonyms suggest a more challenging, time-consuming, and manual approach. For instance, instead of having a one-button coffee maker, you could use a traditional coffee machine that involves grinding, measuring, boiling water, and pouring coffee manually. In brief, antonyms for "push one button" imply a more traditional, intricate, and demanding methodology.