A trench is a deep and narrow hole, or ditch, in the ground, like the kind soldiers on frontlines might dig to give themselves shelter from the enemy.
A natural trench may also be a deep hole on the bottom of the ocean. The verb trench means to dig or to cut into, but you will most often hear the word as a noun, particularly relating to soldiers. The phrase trench warfare became popular around World War I, when technological advances in weapons changed the way that wars were fought. Today, you may have even own a trench coat, a kind of raincoat first worn by soldiers.
Primary Meanings of trench
any long ditch cut in the ground
cut a trench in, as for drainage
impinge or infringe upon
n any long ditch cut in the ground
n a ditch dug as a fortification having a parapet of the excavated earth
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approach trench, communication trench
a trench that provides protected passage between the rear and front lines of a defensive position
a trench especially constructed for the delivery of small-arms fire
ditch dug as a fortification and usually filled with water
narrow trench for shelter in battle
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a long narrow excavation in the earth
n a long steep-sided depression in the ocean floor
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a depression in the floor of the Pacific Ocean off the coast of Chile
a depression in the floor of the Pacific Ocean between New Guinea and the Solomon Islands
a depression in the floor of the Pacific Ocean to the northeast of Japan that reaches depths of 30,000 feet
a depression in the floor of the Atlantic Ocean to the north of Haiti and Puerto Rico