- a short knife for stabbing, sometimes equipped with brass knuckles as a guard, used in modern warfare in hand-to-hand combat.
Origin of trench knife
First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for trench knife
Then with a veritable French trench-knife Madame cut the potatoes into long strips.Modern Essays
- a double-edged steel knife, often with a guard in the form of a knuckle-duster, designed for close combat
C20: so called because such knives were carried by patrols in the Trenches during World War I