WordNet
approach trench
n. a trench that provides protected passage between the rear and front lines of a defensive position [syn: communication trench]
Usage examples of "approach trench".
The zigzag approach trench was almost half-way towards the defences, the head of it almost obscured by flying earth as the Russians fired furiously upon it.
In the flash of an explosion I saw more kzin leaping up another approach trench.