grave trap meaning

• [Architecture]
  

  On a theater stage, an oblong trap, 2 often located toward the front of the stage along its center line.

• grave:    Noun: grave & ...
• s-trap:    [Architecture]An S ...
• trap:    Noun: trap &n ...

Examples

1. The grave trap is complete with its platform . "; they also noted the need for regeneration in the area surrounding the theatre.