slough 1 (sl, slou) also slew (sl)
1. A depression or hollow, usually filled with deep mud or mire.
2. also slue A swamp, marsh, bog, or pond, especially as part of a bayou, inlet, or backwater.
3. A state of deep despair or moral degradation.
[Middle English, from Old English slōh.]
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Indo-European & Semitic Roots Appendices
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