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Noun: thunderbolt  'thún-du(r),bówlt
  1. A discharge of lightning accompanied by thunder
    - bolt, bolt of lightning
  2. A shocking surprise
    "news of the attack came like a thunderbolt";
    - bombshell, thunderclap

Derived forms: thunderbolts

Type of: lightning, surprise, turn-up [Brit, informal]

Encyclopedia: Thunderbolt, GA