Definition of black spots:
(n) :
(transport) A section of roadway that has been designated as being particularly accident-prone.
(n) :
(telecommunications) A location with poor radio signal reception, e.g. for mobile phones.
(n) :
(by extension) A dangerous place or area.
(n) :
(phytopathology, uncountable) A fungal disease among plants, particularly roses, that results in black spots on the leaves.
(n) :
(figurative) A subject or area about which little or no information is available.
(n) :
(snooker) The spot on a snooker table where the black ball is normally placed.