Etymology
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trench (n.)

late 14c., "track cut through a wood," later "long, narrow ditch" (late 15c.), from Old French trenche "a slice, cut, gash, slash; defensive ditch" (13c., Modern French tranche), from trenchier "to cut, carve, slice," possibly from Vulgar Latin *trincare, from Latin truncare "to maim, mutilate, cut off," from truncus "maimed, mutilated," also "trunk of a tree, trunk of the body," of uncertain origin, probably originally "mutilated, cut off," and perhaps from PIE root *tere- (2) "cross over, pass through, overcome."

Trenches for military protection are first so called c. 1500. Trench warfare first attested 1918. Trench-coat first recorded 1916, a type of coat worn by British officers in the trenches during World War I.

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Definitions of trench
1
trench (v.)
impinge or infringe upon;
Synonyms: impinge / encroach / entrench
trench (v.)
fortify by surrounding with trenches;
He trenched his military camp
trench (v.)
cut or carve deeply into;
letters trenched into the stone
trench (v.)
set, plant, or bury in a trench;
trench the vegetables
trench the fallen soldiers
trench (v.)
cut a trench in, as for drainage;
trench the fields
Synonyms: ditch
trench (v.)
dig a trench or trenches;
The National Guardsmen were sent out to trench
2
trench (n.)
a ditch dug as a fortification having a parapet of the excavated earth;
trench (n.)
a long steep-sided depression in the ocean floor;
Synonyms: deep / oceanic abyss
trench (n.)
any long ditch cut in the ground;
From wordnet.princeton.edu