verb
to spend time in a place without any specific purpose or to wait around
adverb
in a casual or relaxed manner
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Please do not hang about in the hallway, it is meant for passing through.
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Hey, hang about for a minute, I have something to tell you.
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Let's hang about at the park and chill for a bit.
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I can't just hang about waiting for things to happen, I need to take action.