A geyser is a spring that dramatically spews hot water and steam — Old Faithful in Yellowstone National Park is one of the most famous.

When a geyser explodes, hot water and steam shoot up out of the ground like some kind of crazy fountain. It's so amazing that people often use this word to describe things that remind them of geysers. If you suddenly make a lot of money, you hit a geyser. If someone is crying uncontrollably, that's a geyser of emotion. If you're writing quickly and well, it feels like a geyser of words. Anything powerfully flowing could be considered a geyser.

Definitions of geyser
  1. noun
    a spring that discharges hot water and steam
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    Old Faithful
    a geyser in Yellowstone National Park that erupts for about 4 minutes about every 65 minutes
    type of:
    fountain, natural spring, outflow, outpouring, spring
    a natural flow of ground water
  2. verb
    to overflow like a geyser
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    type of:
    brim over, overflow, overrun, run over, well over
    flow or run over (a limit or brim)
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