black spot

noun7

1. •
   A section of roadway that has been designated as being particularly accident-prone.

   • Indian Queens is a hamlet just off the A30, a well-known traffic black spot, and Yellowknife was Margo Kidder's hometown in Canada. — 2019
2. •
   A dangerous place or area.
3. •
   A location with poor radio signal reception, e.g. for mobile phones.

   • 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. — 2013
4. •
   A fungal disease among plants, particularly roses, that results in black spots on the leaves.

   • 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. — 2006
5. •
   (figurative) A subject or area about which little or no information is available.
6. •
   A fictional judicial device among pirates, consisting of a black circle indicating condemnation.
7. •
   The spot on a snooker table where the black ball is normally placed.