Dictionary
1. (v. t.) To cut; to form or shape by cutting; to make by incision, hewing, or the like.

2. (v. t.) To fortify by cutting a ditch, and raising a rampart or breastwork with the earth thrown out of the ditch; to entrench.

3. (v. t.) To cut furrows or ditches in; as, to trench land for the purpose of draining it.

4. (v. t.) To dig or cultivate very deeply, usually by digging parallel contiguous trenches in succession, filling each from the next; as, to trench a garden for certain crops.

5. (v. i.) To encroach; to entrench.

6. (v. i.) To have direction; to aim or tend.

7. (n.) A long, narrow cut in the earth; a ditch; as, a trench for draining land.

8. (n.) An alley; a narrow path or walk cut through woods, shrubbery, or the like.

9. (n.) An excavation made during a siege, for the purpose of covering the troops as they advance toward the besieged place. The term includes the parallels and the approaches.

Thesaurus
Bassalia abri abysm abyss abyssal zone adit air-raid shelter approach approach trench aqueduct arroyo barge in bathyal zone benthos bomb shelter bombproof bore bottom bottom glade bottom waters bottomless depths bottoms box canyon breach break break in break in upon bunker burrow burst in butt in canal canalization canalize canyon carve cave cavity chamfer channel channelize chap charge in chasm check chimney chink chisel cleave cleft cleuch clough col concealment conduct conduit convey corrugate coulee couloir countermine coupure course cover covert coverture crack cranny crash crash in crash the gates creep in crevasse crevice crimp crowd in cut cut apart cut in cwm cyclone cellar dado dale defile dell delve dig dig out dike dingle ditch donga double sap drain draw dredge drill drive duct dugout earth edge in egress elbow in encroach engrave entrance entrench entrenchment excavate excavation exit fallout shelter fault fire trench fissure flaw flume flute flying sap foist in fortified tunnel fosse foxhole fracture funk hole funnel furrow gallery gap gape gash gill glen goffer gorge gouge gouge out groove ground grove grub gulch gulf gully gutter ha-ha hole horn in impinge impose impose on impose upon incise incision infiltrate infringe ingress inner space insinuate interfere interlope interpose intervale intervene intrude invade irrupt joint kennel kloof leak lower lunar rill mine moat notch nullah obtrude ocean bottom ocean depths ocean floor open opening parallel pass passage passageway pelagic zone pipe pleat plow press in push in put on put through put upon quarry rabbet ravine rent rifle rift rime rive rupture rush in rut safety zone sap scissure scoop scoop out score scrabble scrape scratch seam shelter shovel sink siphon slink in slip in slit slit trench slot smash in sneak in spade split squeeze in steal in storm cave storm cellar storm in strath streak striate sunk fence the deep the deep sea the deeps the depths throng in thrust in trespass trough troughing troughway tunnel vale valley verge
                                                                                                                                                                                                                                       

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