A dialectal British term for twilight, dusk, or the time when day is fading into darkness.
From dialectal origins, possibly related to 'dim' combined with an old word element. The term is primarily regional to Southwest England and parts of the Midlands.
Dimpsy is a marvelously specific word that British dialectal speakers use for that particular moment when it's no longer day but not quite night—and it's almost lost to modern English except in rural areas, which is sad because we all experience dimpsy but most of us don't have a word for it.
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