ETYM Old Eng. trenche, French tranchée. Related to Trench.
(Irregular plural: trenches).
1. A ditch dug as a fortification having a parapet of the excavated earth.
2. A long steep-sided depression in the ocean floor.
3. Any long cut made in the ground.

1. To cut a drainage tench in; SYN. ditch.
2. To cut or carve deeply into
3. To dig a trench.
4. To dig a trench in
5. To trench on or upon something.
6. To trespass or encroach; infringe; SYN. entrench.