trench

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

a long steep-sided depression in the ocean floor

any long ditch cut in the ground

impinge or infringe upon; "This impinges on my rights as an individual"; "This matter entrenches on other domains"

fortify by surrounding with trenches; "He trenched his military camp"

cut or carve deeply into; "letters trenched into the stone"

set, plant, or bury in a trench; "trench the fallen soldiers"; "trench the vegetables"

cut a trench in, as for drainage; "ditch the land to drain it"; "trench the fields"

dig a trench or trenches; "The National Guardsmen were sent out to trench"