What does "muck" mean?

Additional senses

1. 2.Vegetable mold mixed with earth, as found in low, damp places and swamps.
2. 3.Anything filthy or vile. Spenser.
3. 4.Money; -- in contempt. The fatal muck we quarreled for. Beau. & Fl. Muck bar, bar iron which has been through the rolls only once. -- Muck iron, crude puddled iron ready for the squeezer or rollers. Knight.
4. 5.Like muck; mucky; also, used in collecting or distributing muck; as, a muck fork.
5. 6.To manure with muck.