As a Noun: 1. The sudden outpouring or emission of light, sound, or energy from some source. 2. A sudden great increase in something. English = surge. 3. A sudden outburst of light. English = flash. 4. A sudden outburst of loud noise from the mouth of an animal. English = roar. As a Verb or Adjective: 1. To emit or let out a sudden outburst of light, sound, or energy. 2. To move forward, out of, or from something suddenly and with great energy. English = surge. 3. To emit a sudden outburst of light. English = flash. 4. Of an animal, to emit a sudden outburst of loud noise from its mouth. English = roar.