Reduced the brightness of light, or made something less clear or prominent.
From Old English 'dim,' related to Old Norse 'dimmr,' meaning murky or dark. The verb form with '-ed' became common in Middle English to describe the act of making something less bright.
Interestingly, the word 'dim' originally had nothing to do with light—it comes from the same root as 'dusk,' and ancient people used it to describe the time of day before 'dimmed lights' was even a concept.
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