back shutter

back flap, back fold, back shutter

The leaf in a window shutter that folds behind the exposed leaf of the shutter; that part of a window shutter that folds into a recess in the window casing.

backflap hinge, flap hinge

A hinge having a flat plate or strap which is screwed to the face of a shutter or door.
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References in classic literature ?
Muldoon was then on the premises, and she loquaciously attended the visitors, preceding them from room to room and pushing back shutters and throwing up sashes - all to show them, as she remarked, how little there was to see.
During the journey, Tony managed to help police by unlocking the back shutter and telling them which road they were on.
Staff and volunteers came into work to find the raiders had smashed their way through the back shutters and forced the safe open.