(slou for defs. 1 and 4; sl for defs. 2 and 3) noun
1. A place of deep mud or mire; bog.
2. A depression in a prairie, often dry but sometimes deeply miry, forming part of the natural drainage system.
3. A stagnant swamp, backwater, bayou, inlet, or pond in which water backs up: also spelled slew, slue.
4. A state of moral depravity or of despair. [OE slōh]
—slough′y adjective

(sluf) noun
1. Dead tissue separated and thrown off from the living parts, as in gangrene; also, a scab.
2. The skin of a serpent that has been or is about to be shed; cast.
—v.t.
1. To cast off, as dead from living tissue; shed.
2. To discard; shed, as a habit or a growth; get rid of as useless or needless.
—v.i.
3. To be cast off.
4. To cast off a slough or tissue; form a scab. [ME slouh]
—slough·y adjective

(slou)
A municipal borough of SE Buckingham, England.