The phrase "gets in act" refers to the process of taking action or beginning to do something. Antonyms for this phrase would include words that convey the opposite meaning or suggest the absence of action or movement. For example, "stagnant," "inactive," "idle," "dormant," and "motionless" all suggest a lack of activity, energy, or movement. Other antonyms could include "retreat," "withdraw," and "standstill," which suggest a ceasing of activity or forward progress. Whatever the antonym, it is clear that "gets in act" is a phrase that represents a shift from inaction to action, and its opposite would represent a return to stillness, inactivity, or non-movement.