1. muck about do random, unplanned work or activities; spend time idly
  2. megabit a unit of information equal to 1000 kilobits or 10^6 bits
  3. megabat large Old World bat of warm and tropical regions that feeds on fruit
  4. kick about be around; be alive or active
  5. megabyte a unit of information equal to 1000 kilobytes or 10^6 bytes
  6. knock about strike against forcefully
  7. megapode large-footed short-winged birds of Australasia
  8. knockabout full of rough and exuberant animal spirits
  9. mill about move about in a confused manner
  10. mess about be about
  11. Macbeth king of Scotland (died in 1057)
  12. moon about be apathetic, gloomy, or dazed
  13. marabout large African black-and-white carrion-eating stork
  14. macabre shockingly repellent; inspiring horror
  15. come about come to pass
  16. make out detect with the senses
  17. jackboot (19th century) a man's high tasseled boot
  18. go about begin to deal with
  19. sackbut a medieval musical instrument resembling a trombone
  20. muck up soil with mud, muck, or mire