red zone

Short definition from Wiktionary

Noun

1. 1
   The area extending twenty yards from the end zone, where a team in possession of the ball is expected to score.
2. 2
   An area of a street where the curb has been painted red, indicating that stopping, standing or parking is prohibited at that spot (except, in some places, for buses).
3. 3
   Any other area so classified.

Verb

1. 1
   To categorize as too damaged to repair, and requiring the owners to vacate (a property).