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Verb: mess about
  1. Be about
    "The high school students like to mess about in the Central Square";
    - loiter, lounge, footle, lollygag [N. Amer], loaf, lallygag [N. Amer], hang around, tarry, linger, lurk, mill about, mill around, mooch [Brit]

Derived forms: messed about, messes about, messing about

Type of: be