Erupt/ɪˈrʌpt/ Definition 1 of 4Pro Tip 1/2Sudden Release Erupt describes an immediate and often powerful release, similar to something bursting. The geyser erupted, sending steam high into the air. Pro Tip 2/2Natural Phenomena Often used to describe natural events like volcanic activity, geysers, or geothermal events. The hot springs erupted as temperatures rose.