Definition of water-bomb in US English:

water-bomb

verb

  • with object To attack or strike with a water bomb, or (more generally) a large quantity of water; to direct a water bomb at; especially to release a large quantity of water on to (a fire) from the air as a firefighting measure.

Origin

1940s; earliest use found in The Hammond Times. From water + bomb, after water bomb.

Pronunciation

water-bomb

/ˈwɔːtəbɒm/