Geyser (noun)
Basic Definition: A geyser is a natural spring that sends hot water and steam into the air. It happens when water underground gets heated by hot rocks and then bursts out through the surface.
Usage Instructions: You can use "geyser" to talk about this specific type of hot spring. It is commonly found in areas with volcanic activity.
In more advanced contexts, "geyser" can also refer to something that erupts or overflows suddenly, similar to how a geyser of water shoots up.
There are no specific idioms or phrasal verbs that use "geyser," but you might hear phrases like "to burst forth" or "to blow up" used in a similar context.