(trim) 1) A pre-plotted height for a piece of scenery or lighting bar - "that bar's on its dead". Sometimes flying pieces are given a number of extra deads, that may be colour coded, in addition to the "in dead" (lower) and "out dead" (higher - out of view). In the US, Trim has the same meaning. 2) Scenery or equipment not needed for current production - "that table's dead". 3) An electric circuit that has been switched off or has failed.