Verb mill about has 2 senses
  1. loiter, lounge, footle, lollygag, loaf, lallygag, hang around, mess about, tarry, linger, lurk, mill about, mill around - be about; "The high school students like to loiter in the Central Square"; "Who is this man that is hanging around the department?"
    --1 is one way to be
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
  2. mill, mill about, mill around - move about in a confused manner
    --2 is one way to move
    Sample sentence:
    Something ----s
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