Wiktionary
vb. (context intransitive usually of a group of people English) To move or circulate in a confused or disorderly manner within a limited are
WordNet
v. be about; "The high school students like to loiter in the Central Square"; "Who is this man that is hanging around the department?" [syn: loiter, lounge, footle, lollygag, loaf, lallygag, hang around, mess about, tarry, linger, lurk, mill about]
move about in a confused manner [syn: mill, mill about]
Usage examples of "mill around".
The horses were cantering past and beginning to mill around the gate.
If we can knock down the leader, the rest will mill around inspectin’.
We watched the townspeople mill around beyond the bright yellow crash barricades that were going up.
A pair of mules walked the boom of the mill around, while a muleteer from time to time cut at one or the other with his whip.