WordNet (r) 3.0 (2006):

hang around
    v 1: 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, mill
         around]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "hang around":
   abide, affect, await, bide, bide the issue, bum around, dally,
   dawdle, delay, dillydally, do nothing, frequent, goof off,
   hang about, hang out, hang out at, haunt, hold everything, hold on,
   hold your horses, idle, laze, lazy, lie around, linger, loaf,
   loiter, loiter about, loll around, lollop around, lounge,
   lounge around, mark time, mooch around, moon, moon around, resort,
   resort to, sit around, sit tight, sit up, slouch, slouch around,
   stand around, stay, stay up, stick around, take time, tarry, wait,
   wait a minute, wait and see