safety curtain safety curtain /ˈseɪfti ˈkɜːrtən/

noun

1. A fireproof theater curtain to be dropped in case of fire  ( safety curtain )
   a fireproof theater curtain to be dropped in case of fire
    In the event of a fire, the theater's safety curtain descends to prevent the spread of flames.
   In the event of a fire, the theater's safety curtain descends to prevent the spread of flames.