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Noun: thunderclap  'thún-du(r),klap
  1. A single sharp crash of thunder
    "A loud thunderclap shook the windows"
     
  2. A shocking surprise
    "news of the attack came like a thunderclap";
    - bombshell, thunderbolt

Derived forms: thunderclaps

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

Encyclopedia: Thunderclap