dead zone
noun /ˈded zəʊn/
  /ˈded zəʊn/
- a place or a period of time in which nothing happens
- The town is a cultural dead zone.
 
 - an area that separates two places, groups of people, etc.
- The UN is trying to maintain a dead zone between the warring groups.
 
 - a place where a mobile phone does not work because no signal can be received
 - (biology) an area of water in which animals cannot live because there is not enough oxygen