water cannon noun
: a machine that shoots a large, powerful stream of water and that is used by police to control violent crowds
: a large truck-mounted nozzle for directing a high-pressure stream of water (as at a crowd of rioters or demonstrators)
First Known Use of WATER CANNON
Seen & Heard
What made you want to look up water cannon? Please tell us where you read or heard it (including the quote, if possible).