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water cannon

American

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.

water cannon British

noun

an apparatus for pumping water through a nozzle at high pressure, used in quelling riots

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of water cannon

First recorded in 1965–70

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Berlin police used water cannon to help residents of the capital cool off on Saturday and will repeat the operation on Sunday.

From Barron's • Jun. 28, 2026

He identified the two unnamed chemicals as those likely to have been added into the water cannon.

From BBC • Nov. 30, 2025

The Taiwanese boats also have water cannon and a 20-millimetre static machine gun, but are careful to avoid a confrontation that "could lead to unimaginable consequences", Huang said.

From Barron's • Nov. 11, 2025

One woman brandished a Georgian flag as she braved a stream of water cannon, while another walked headlong into a barricade of police standing behind riot shields.

From BBC • Dec. 4, 2024

He wore a black ski mask and carried a large, complex green water cannon.

From "Paper Towns" by John Green

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023