water cannon is a noun meaning "a hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters)". It carries one recorded sense.
a hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters)
Definitions, synonyms and semantic relations for water cannon come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.