Antonyms for the phrase "mills around" include actions that are focused, purposeful, and forward-moving. Some examples of antonyms could include activities such as marching, working industriously, or standing in line. Rather than aimlessly wandering or milling around, these activities involve deliberate movements or focused attention on a set task or objective. Other antonyms could include words such as organizing, settling, streamlining, or arranging, all of which suggest a sense of order and control in contrast to the chaotic or disorganized actions that might typically be associated with milling around. By engaging in these activities, individuals can optimize their time and energy, making progress towards their goals in a more efficient manner.