chimey
ditch?
A lunar trench is called a Rille (the German word for groove).
Ignoring someone or ruining their plans, making them feel unwanted.
Culvert or a swale.
trench fosse
Mac, mackintosh, trench coat, slicker, poncho, overcoat...
Trench warfare. Warfare fought between men in trenches. No, I think trench warfare is about as good as it gets. Would the word "attrition" work for you? - attrition: constant wearing down to weaken or destroy (often in the phrase war of attrition)
"The World war 1 trench was the biggest I have found" or "The trench in the ocean was the biggest in the world"
A lunar trench is called a Rille (the German word for groove).
Another word for a deep ditch that is dug around a castle is a moat. You could call it a trench, or you could fill it full of water and call it a moat.
Schützengraben
Stench Trench