n. 1 ordure, manure, dung, excrement, faeces, droppings; guano The muck is saved for use as fertilizer 2 dirt, filth, bilge, slime, sludge, ooze, scum, sewage, mire, mud, feculence, Colloq gunge, gunk, US grunge Give me a chance to get the muck off my shoes
v. 3 muck about. fool around, waste time, idle, loiter, mess around or about She told me to stop mucking about and get a job 4 muck up. ruin, wreck, destroy, make a mess of, botch, mess up, bungle, Colloq screw up, Slang bugger up, make a muck of She's mucked up her own life, and, given the chance, she'll muck up mine