trench
noun
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a ditch dug as a fortification having a parapet of the excavated earth
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any long ditch cut in the ground
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a long steep-sided depression in the ocean floordeep
verb
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dig a trench or trenches“The National Guardsmen were sent out to trench”
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cut a trench in, as for drainageditch
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set, plant, or bury in a trench“trench the fallen soldiers”
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cut or carve deeply into“letters trenched into the stone”
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fortify by surrounding with trenches“They trenched their military camp.”
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impinge or infringe uponentrenchencroachimpinge