To taper.
To disappear gradually.
To take away; to subtract.
To make smaller.
To lessen the authority or dignity of; to put down; to degrade; to abase; to weaken; to nerf (in gaming).
To become less or smaller.
To do a dirty job.
To manure with muck.
To shovel muck.
To vomit.
To pass, to fold without showing one's cards, often done when a better hand has already been revealed.
Heroin.
Semen.
Soft (or slimy) manure.
The pile of discarded cards.
Anything filthy or vile. Dirt; something that makes another thing dirty.
Grub, slop, swill
Slimy mud, sludge.