'Shutter' and 'shudder' are two different words.
Shutter
noun
1. a solid or louvered movable cover for a window.
2. a movable cover, slide, etc., for an opening.
3. a person or thing that shuts.
4. Photography . a mechanical device for opening and closing the aperture of a camera lens to expose film or the like.
verb (used with object)5. to close
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