Hinged or sliding window coverings that can be opened or closed to control light and air, or to protect windows from damage.
From Old French 'escout' or 'scut' meaning a shield or cover, combined with '-er' to make it an agent noun. Originally, shutters were solid wooden panels that physically protected windows from weather and intruders before modern glass was standard.
Shutters used to be actual protective barriers for medieval windows because glass was expensive and fragile—they were hardware, not decoration. Now they're mostly decorative in wealthy homes but are still functional protection in hurricane-prone areas, showing how old words can mean completely different things depending on where you live.
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