1. noun
    any of various long-tailed primates (excluding the prosimians)
  2. verb
    do random, unplanned work or activities or spend time idly; "The old lady is usually mucking about in her little house"
  3. verb
    play around with or alter or falsify, usually secretively or dishonestly; "Someone tampered with the documents on my desk"; "The reporter fiddle with the facts"
  4. noun
    one who is playfully mischievous