Define muck. muck synonyms, muck pronunciation, muck translation, English dictionary definition of muck. n. 1. A moist sticky mixture, especially of mud and filth. Define muck (verb) and get synonyms. What is muck (verb)? muck (verb) meaning, pronunciation and more by Macmillan Dictionary. 1muck something outRemove manure and other dirt from a horse's stable or other animal's dwelling. 'I was mucking out some of the dirtiest piggeries I had ever. Presently there was a distant blare of military music; it came nearer, still nearer, and soon a noble cavalcade wound into view, glorious with plumed helmets and flashing mail and flaunting banners and rich doublets and horse-cloths and gilded spear- heads; and through the muck and swine, and naked brats, and joyous dogs, and shabby huts, it took its gallant way, and in its wake we followed. Agriculture to spread manure upon fields, gardens, etc. Top tips for better writing Some advice to nail your writing assignments. Crews were facing difficult conditions in their search at the Tonto National Forest, where the stream bed was coated with thick mud and searchers made slow progress in past days trying to move through muck up to their knees. To cause problems for someone or something: Its friday , course we're muckin Winston's tonight. Lord Muck , Lady Muck. British Dictionary definitions for muck Expand. Times, Sunday Times It's as clear as the muck pumped out of a Stobart exhaust pipe. Definition of muck for English Language Learners.