noun
a hot spring that intermittently sends up fountain-like jets of water and steam into the air
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The geyser erupted with tremendous force, sending hot water and steam high into the air.
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We were lucky to catch a glimpse of the geyser going off during our visit to Yellowstone.
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That geyser is lit, it's like nature's own fireworks display!
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Her anger was like a geyser, bubbling beneath the surface until it finally erupted.