Definitions
1.NounA boiling natural spring which throws forth jets of water, mud, etc., at frequent intervals, driven upwards by the expansive power of steam.
2.NounA momentary vertical jet or fountain of fluid driven upwards by a violent force.
3.NounAn instantaneous, and often dangerous, hot water heater.
4.NounA domestic water boiler.
5.VerbTo (cause to) rush or burst upward like water from a geyser.