stage whisper

  1. a loud whisper by an actor on the stage, heard by the audience but supposed not to be heard by other actors on stage
  2. any similar loud whisper meant to be overheard

See stage whisper in American Heritage Dictionary 4

noun
  1. The conventional whisper of an actor, intended to be heard by the audience but supposedly inaudible to others on stage.
  2. A whisper that can be or is intended to be overheard.

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