Definitions from Wiktionary ( )

▸ noun:  (uncountable) Soot.
▸ noun:  (countable) A flake of ash or soot.
▸ noun:  (uncountable) Sexually vulgar material; something that is sexual in a dirty way; pornographic material.
▸ noun:  (uncountable) Obscene language; ribaldry; obscenity.
▸ noun:  Any of a range of fungi, mostly Ustilaginomycetes, that cause plant disease in grasses, including cereal crops; the disease so caused.
▸ noun:  (mining) Bad, soft coal containing earthy matter, found in the immediate locality of faults.
▸ noun:  (countable, slang, archaic) A copper boiler.
▸ verb:  (ambitransitive) To stain (or be stained) with soot or other dirt.
▸ verb:  (transitive) To taint (grain, etc.) with the smut fungus.
▸ verb:  (intransitive) To become tainted by the smut fungus.
▸ verb:  (transitive) To clear of the smut fungus.

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