The amount of something that can fit into a pocket; a small amount or quantity of something.
From 'pocket' (a small pouch sewn into clothing) plus the suffix '-ful' meaning 'as much as.' This is a straightforward compound word that became standard around the 18th century.
Words ending in '-ful' are interesting because they technically suggest 'full,' but a 'pocketful' isn't actually a precise measurement—it means 'whatever fits,' which is why it's charmingly vague and perfect for poetry!
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