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Noun: rat-a-tat  ,ra-tu'tat
  1. A series of short sharp taps (as made by strokes on a drum or knocks on a door)
    "The rat-a-tat-tat of the woodpecker echoed through the forest";
    - rat-a-tat-tat, rat-tat

Derived forms: rat-a-tats

Type of: tapping