1.
No-man’s land is an area of land that is not owned or controlled by anyone, for example the area of land between two opposing armies.
In Tobruk, leading a patrol in ~, he was blown up by a mortar bomb.
...the ~ between the Jordanian and Iraqi frontier posts.
N-UNCOUNT: also a N
2.
If you refer to a situation as a ~ between different things, you mean that it seems unclear because it does not fit into any of the categories.
The play is set in the dangerous ~ between youth and adolescence...
N-SING