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Trench (Noun)

Any long ditch cut in the ground.

Nouns denoting man-made objects.

The soldiers dug a trench to protect themselves from enemy fire during the battle.
The farmer created a trench to irrigate his crops by channeling water from the nearby stream.
The construction crew dug a trench to lay the foundation for the new highway.
The archaeologists excavated a trench to uncover the ancient ruins hidden beneath the earth.
The gardener dug a trench to plant a row of trees along the edge of the property.

A long steep-sided depression in the ocean floor.

Nouns denoting natural objects (not man-made).

The Mariana Trench is the deepest point in the ocean, with a maximum depth of over 36,000 feet.
The Andes mountain range continues underwater as a trench that runs along the western edge of South America.
The Kermadec Trench is a deep-sea trench located northeast of New Zealand, where the Pacific plate is being subducted.
The oceanic crust is being pulled down into the trench by the process of subduction, where it is melted and recycled.
The Challenger Deep is the lowest point in the Mariana Trench, a staggering 35,787 feet below sea level.

A ditch dug as a fortification having a parapet of the excavated earth.

Nouns denoting man-made objects.

The soldiers took cover behind the trench, using the earthen parapet for protection from enemy fire.
A long, winding trench had been dug along the edge of the battlefield, its walls reinforced with sandbags.
The commander ordered his troops to dig a trench around the perimeter of the camp to defend against potential attackers.
As the enemy approached, the soldiers scrambled to complete the trench, shoveling dirt and rocks into place to create a barrier.
The trench was so deep and narrow that it was almost impossible to climb out of it without assistance.