Plain English Meaning
A spot you can't see — or can't reach with a signal — from where you're sitting. The view or signal is blocked by something in the way.
Full Definition
An area on the ground that cannot be seen from a specific position, typically due to terrain, structures, or curvature of the earth, resulting in loss of radio or radar coverage, or loss of visual contact with traffic, runway features, or other aircraft.
Context Anchor
Seen in aviation communication discussions, especially when terrain, distance, or coverage limits affect whether a radio call can be received.
Derivation
Plain English . 'Blind' meaning to see, and 'spot' meaning a specific location — together, a place where seeing (or detecting) is not possible.