Puts something into a container until it's full, or completes an empty space or need.
From Old English 'fyllan,' from Proto-Germanic *fulljan, related to 'full,' meaning to make full or complete.
The word 'fulfill' actually contains this root—when you 'fill' a requirement, you're literally making it 'full' of completion, showing how metaphors about containers shaped how we describe abstract concepts in English.
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