water cannon

water cannon

noun
a truck-mounted hose or pipe that shoots a jet of water through a nozzle at extremely high pressure, used especially in dispersing rioters or demonstrators.

Origin:
1965–70

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World English Dictionary
water cannon
 
n
an apparatus for pumping water through a nozzle at high pressure, used in quelling riots

Collins English Dictionary - Complete & Unabridged 10th Edition
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