black spot

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See also: blackspot

English

black spot leaf disease (1)
accident blackspot warning sign (2)

Alternative forms

Noun

black spot (plural black spots)

  1. (phytopathology) A fungal disease among plants, particularly roses, that results in black spots on the leaves.
    • 2006, Mary Moody, Mary Moody's Roses, Allen & Unwin, →ISBN, page 20:
      In areas where black spot is only a problem after heavy rain or later in the season, restrict spraying to these times, or if yellowing or spotted foliage is detected.
  2. (transport) A section of roadway that has been designated as being particularly accident-prone.
    Synonym: accident blackspot
    • 2019, Will Birch, Cruel To Be Kind: The Life and Music of Nick Lowe‎, Hachette UK, →ISBN:
      Indian Queens is a hamlet just off the A30, a well-known traffic black spot, and Yellowknife was Margo Kidder's hometown in Canada.
  3. (by extension) A dangerous place or area.
  4. (telecommunications) A location with poor radio signal reception, e.g. for mobile phones.
    • 2013, Judith Cutler, Life Sentence‎, Allison & Busby, →ISBN:
      What if—like so many rural parts of the county—this was a mobile black spot? That was easily tested. No, she had no problem dialling her own home number.
  5. (fiction) A fictional judicial device among pirates, consisting of a black circle indicating condemnation.
    • 1881–1882, Robert Louis Stevenson, Treasure Island, London, Paris: Cassell & Company, published 14 November 1883, →OCLC, part I (The Old Buccaneer), page 31:
      I went down on my knees at once. On the floor close to his hand there was a little round of paper, blackened on the one side. I could not doubt that this was the black spot; and taking it up, I found written on the other side, in a very good, clear hand, this short message: “You have till ten to-night.”
  6. (snooker) The spot on a snooker table where the black ball is normally placed.

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