When it comes to synonyms for "gotten in to act," there are quite a few options to choose from. Some common alternatives include phrases such as "sprang into action," "took initiative," "responded immediately," or "jumped into action." Each of these phrases suggests a quick, decisive response to a given situation or problem, indicating that the person in question is proactive, resourceful, and ready to take on challenges at a moment's notice. Depending on the context of the particular situation, one of these synonyms may be more appropriate than others, but all convey a sense of urgency and purpose that is essential to being an effective problem-solver.