Origins
The English word "shutter," referring to each of a pair of hinged panels fixed inside or outside a window that can be closed for security, privacy, or to keep out light, derives from a straightforward morphological composition of the verb "shut" combined with the agent or instrumental suffix "-er." This formation literally denotes "that which shuts," indicating an object whose primary function is to close or block an opening.
Tracing the etymology of "shut," the root of "shutter," leads us back to Old English "scyttan," a verb meaning "to shut, to close, to bolt, to bar a door." This Old English term is inherited from Proto-Germanic *skutjaną, which carried the sense of "to push," "to shoot," or "to bar." The Proto-Germanic root itself is related to *skeutaną, meaning "to shoot" or "to hurl," suggesting a semantic field centered on the action of propelling or thrusting something swiftly.
Further back, the ultimate origin of these Germanic roots is found in the Proto-Indo-European (PIE) root *skewd-, which means "to shoot," "to hurl," or "to propel quickly." This PIE root is the source of a number of English words associated with the idea of shooting or rapid movement. Cognates and derivatives include "shoot," "shot," and "shout" (the latter originally connected to the idea of shooting words or sounds forth), as well as "sheet," which originally referred to a cloth that is "shot" or spread across a bed. The semantic connection between these words lies in the concept of something being propelled or moved swiftly across a space.
Development
The term "shutter" emerged in English during the 16th century, a period when the use of hinged panels to cover windows was common in domestic architecture. The word's formation from "shut" plus "-er" fits the pattern of English agent or instrument nouns, where "-er" denotes an entity performing an action or serving as an instrument. Thus, a "shutter" is literally "that which shuts," emphasizing its functional role.
Interestingly, the notion of a shutter as "that which shoots across an opening to close it" can be understood both literally and metaphorically. In the case of window shutters, the panels may swing or slide across an aperture to block light or provide security. This physical action aligns with the root meaning of "to shoot" or "to propel," as the shutter moves swiftly to cover the window.
The word "shutter" later acquired an additional, specialized meaning in the realm of photography. The photographic sense of "shutter" appeared in 1862, coinciding with the development of mechanical cameras that required a device to control exposure by briefly opening and closing in front of the lens. This photographic shutter functions by rapidly moving a barrier across the film plane, controlling the amount of light reaching the film or sensor. The adoption of "shutter" for this device is a metaphorical extension of the original sense, emphasizing the action of shooting or moving across an opening to regulate light.