trenches is a form of:

Trench



noun
1.
(a long narrow cut in the earth, a deep ditch, especially one dug by troops as shelter from enemy's fire, a groove, a wrinkle, something resembling a trench) ប្រឡាយ, រណ្ដៅ, (racheeartere) dig a trench ស្នាមភ្លោះ, battle trench លេណដ្ឋាន
verbpast tense: trenched ; past participle: trenched ; present participle: trenching ;
1.
(TRANSITIVE) (To cut or dig into pits or ditches, to dig a deep furrow. -trench on upon, to encroach, to trespass, to be almost, to verge on) ជីកស្នាមភ្លោះ (នៅ)
Example: Soldiers dig trenches to shoot from, to trench a field for drainage.
ENGLISH MEANING
noun
1.
A long, narrow cut in the earth; a ditch; as, a trench for draining land.
2.
An alley; a narrow path or walk cut through woods, shrubbery, or the like.
3.
An excavation made during a siege, for the purpose of covering the troops as they advance toward the besieged place. The term includes the parallels and the approaches.
verbpast tense: trenched ; past participle: trenched ; present participle: trenching ;
1.
(TRANSITIVE) To cut; to form or shape by cutting; to make by incision, hewing, or the like.
2.
(TRANSITIVE) To fortify by cutting a ditch, and raising a rampart or breastwork with the earth thrown out of the ditch; to intrench.
3.
(TRANSITIVE) To cut furrows or ditches in; as, to trench land for the purpose of draining it.
4.
(TRANSITIVE) To dig or cultivate very deeply, usually by digging parallel contiguous trenches in succession, filling each from the next; as, to trench a garden for certain crops.
5.
(INTRANSITIVE) To have direction; to aim or tend.
1.
To encroach, to intrench