Definition of black spot
1
: any of several bacterial or fungal diseases of plants characterized by black spots or blotches especially on the leaves
2
chiefly British
: a dangerous or troublesome place or area
… Wisteria Lane has always been a major accident black spot.— Jane Simon
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Merriam-Webster unabridged
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Time Traveler for black spot
The first known use of black spot was in 1832
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