Some is used to talk about an unknown or not exact amount of something. It can also mean “a certain” when you don’t want to say exactly who or what.
From Old English *sum* meaning “one, a certain one, some,” related to German *sum* and Sanskrit *sam* meaning “together.” It originally had a stronger sense of “a particular one” than today.
In phrases like “some guy” or “some day,” *some* quietly suggests “I don’t know or care which one exactly.” It’s a tiny word that lets you be fuzzy on purpose—very handy in everyday speech.
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