[n] a ditch dug as a fortification having a parapet of the excavated earth
[n] any long ditch cut in the ground
[n] a long steep-sided depression in the ocean floor
[v] dig a trench or trenches; "The National Guardsmen were sent out to trench"
[v] cut a trench in, as for drainage; "ditch the land to drain it"; "trench the fields"
[v] set, plant, or bury in a trench; "trench the fallen soldiers"; "trench the vegetables"
[v] cut or carve deeply into; "letters trenched into the stone"
[v] fortify by surrounding with trenches; "He trenched his military camp"
[v] impinge or infringe upon; "This impinges on my rights as an individual"; "This matter entrenches on other domains"