soot
US /sʊt/
UK /sʊt/
1.
a black powdery substance consisting chiefly of amorphous carbon, produced when organic matter is burned incompletely.
:
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The chimney was covered in thick soot.
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After the fire, everything was covered in soot.
1.
to cover or blacken with soot
:
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The old fireplace had sooted the wall above it.
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The fire alarm was triggered because the candles sooted the ceiling.