Definition of muck noun from the Oxford Advanced Learner's Dictionary

     

    muck

     noun
    noun
    BrE BrE//mʌk//
     
    ; NAmE NAmE//mʌk//
     
     
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  1. 1waste matter from farm animals synonym manure to spread muck on the fields The tractors are out spreading muck.
  2. 2(informal, especially British English) dirt or mud Can you wipe the muck off the windows? My face and hands were covered in muck.
  3. 3(informal, especially British English) something very unpleasant I can't eat this muck!
  4. Word Origin Middle English muk, probably of Scandinavian origin: compare with Old Norse myki ‘dung’, from a Germanic base meaning ‘soft’, shared by meek.Idioms
    where there’s muck there’s brass
     
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    (British English, saying) used to say that a business activity that is unpleasant or dirty can bring in a lot of money
See the Oxford Advanced American Dictionary entry: muck