trench mortar

trench mortar

noun
a portable, muzzle-loaded mortar, usually having a smooth bore, fired at high angles of elevation to reach concealed enemy targets.

Origin:
1915–20

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World English Dictionary
trench mortar
 
n
a portable mortar used in trench warfare to shoot projectiles at a high trajectory over a short range

Collins English Dictionary - Complete & Unabridged 10th Edition
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