Definition of "Trench" :
noun: a ditch dug as a fortification having a parapet of the excavated earth
noun: any long ditch cut in the ground
noun: a long steep-sided depression in the ocean floor
verb: dig a trench or trenches
"The National Guardsmen were sent out to trench."
verb: cut a trench in, as for drainage
"Trench the fields."
verb: set, plant, or bury in a trench
"Trench the fallen soldiers."
verb: cut or carve deeply into
"Letters trenched into the stone."
verb: fortify by surrounding with trenches
"He trenched his military camp."
verb: impinge or infringe upon
"This matter entrenches on other domains."