
A Trench knife is a combat knife designed to kill or gravely incapacitate an enemy soldier at close quarters, as might be encountered in a trenchline or other confined area. It was developed in response to a need for a close combat weapon for soldiers conducting assaults and raids on enemy trenchlines during the First World War. An example of a Wo...
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http://en.wikipedia.org/wiki/Trench_knife

The Trench Knife was a military fighting knife used during the Great War. It comprised a 6.5 inch dagger-shaped blade attached to a heavy brass handle incorporating a knuckle-duster and with a pointed spike for smashing into an adversary's skull.
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http://www.probertencyclopaedia.com/browse/FT.HTM

[
n] - a knife with a double-edged blade for hand-to-hand fighting
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http://www.webdictionary.co.uk/definition.php?query=trench%20knife
noun a knife with a double-edged blade for hand-to-hand fighting
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https://www.encyclo.co.uk/local/20974
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