Go about hurriedly here and there, as in I have been running around all day so I want to stay home tonight and relax. [Early 1900s]
Also, run around with. Associate or consort with socially, as in At college she began to run around with a very liberal group. [Late 1800s]
Be sexually unfaithful, as in She caught him running around just once too often and finally sued for divorce. [Early 1900s]
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