Source : Webster's Revised Unabridged Dictionary (1913)

Rappel \Rap"pel\, n. [F. Cf. {Repeal}.] (Mil.)
   The beat of the drum to call soldiers to arms.

Source : WordNet®

rappel
     v : lower oneself with a double rope coiled around the body from
         a mountainside; "The ascent was easy--roping down the
         mountain would be much more difficult and dangerous";
         "You have to learn how to abseil when you want to do
         technical climbing" [syn: {abseil}, {rope down}]
     [also: {rappelling}, {rappelled}]