UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈmʌk/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/mʌk/ ,USA pronunciation: respelling(muk)

WordReference Random House Learner's Dictionary of American English © 2020
muck /mʌk/USA pronunciation   n. [uncountable]
  1. animal waste matter used as fertilizer;
  2. mud, filth, dirt, or slime.
  3. insulting remarks to hurt the reputation of another:stirring up muck about his political opponent.

  1. [Informal.]to make dirty;
    soil:[+ up + object]He had mucked up his clothes in the barnyard.
  2. Informal Termsmuck about or  around, [no object]to waste time:He was mucking about the house all summer.
  3. muck up, [Informal.]to make a mess of* fail badly at;
    bungle: [+ up + object]He had mucked up the whole report.[+ object + up]He must have mucked it all up.
muck•y, adj., -i•er, -i•est.

WordReference Random House Unabridged Dictionary of American English © 2020
muck  (muk),USA pronunciation n. 
  1. moist farmyard dung, decaying vegetable matter, etc.;
  2. Agriculturea highly organic, dark or black soil, less than 50 percent combustible, often used as a manure.
  3. mire;
  4. filth, dirt, or slime.
  5. defamatory or sullying remarks.
  6. a state of chaos or confusion:to make a muck of things.
  7. Informal Terms, British Terms[Chiefly Brit. Informal.]something of no value;
  8. Mining(esp. in mining) earth, rock, or other useless matter to be removed in order to get out the mineral or other substances sought.

  1. Agricultureto manure.
  2. to make dirty;
  3. to remove muck from (sometimes fol. by out).
  4. Informal Terms
    • to ruin;
      bungle (often fol. by up).
    • to put into a state of complete confusion (often fol. by up).
  5. Informal Termsmuck about or  around, to idle;
    waste time;
  • Old Norse myki cow dung
  • Middle English muc, muk 1200–50

Collins Concise English Dictionary © HarperCollins Publishers::
muck /mʌk/ n
  1. farmyard dung or decaying vegetable matter
  2. Also called: muck soil an organic soil rich in humus and used as a fertilizer
  3. dirt or filth
  4. slang chiefly Brit rubbish
  5. make a muck ofslang chiefly Brit to ruin or spoil
vb (transitive)
  1. to spread manure upon (fields, gardens, etc)
  2. to soil or pollute
  3. (often followed by out) to clear muck from
Etymology: 13th Century: probably of Scandinavian origin; compare Old Norse myki dung, Norwegian myk
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