Definitions from Wiktionary (geyser)

▸ noun:  (planetology, geology, volcanology) A boiling natural spring which throws forth jets of water, mud, etc., at frequent intervals, driven upwards by the expansive power of steam.
▸ noun:  (by extension) A momentary vertical jet or fountain of fluid driven upwards by a violent force.
▸ noun:  (British, archaic) An instantaneous, and often dangerous, hot water heater.
▸ noun:  (South Africa, South Asia) A domestic water boiler.
▸ verb:  (ambitransitive) To (cause to) rush or burst upward like water from a geyser.
▸ Also see geyser

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