So a stage whisper is defined as (American Heritage Dictionary):
- The conventional whisper of an actor, intended to be heard by the audience but supposedly inaudible to others on stage.
- A whisper that can be or is intended to be overheard.
Is there any good description of the opposite? For example, if I'm in a crowded place, and I mock-yell under my breath so that only I or a single friend am actually aware of it, how could we describe that?