mucking

/M AH1 K IH0 NG/
verb
  1. 1

    To shovel muck.

    โ€œWe need to muck the stable before it gets too thick.โ€

  2. 2

    To manure with muck.

  3. 3

    To do a dirty job.

  4. 4

    To pass, to fold without showing one's cards, often done when a better hand has already been revealed.

Source: https://en.wiktionary.org/wiki/muck, https://en.wiktionary.org/wiki/mucking