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To loiter, wander around, or waste time idly (some place). I'll just mill around in the store across the street while you get your hair cut. There were a bunch of teenagers milling around near the entrance to the store, and it was making me a little bit nervous.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mill aroundand mill about
to wander or move around aimlessly within a small area. Everyone was milling around, looking for something to do. The students milled about between classes.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.