An informal word for a child or young person; also means something designed for or suitable for children.
From 'kid' (originally slang for a young goat, then applied to children in the 1600s) plus the diminutive suffix '-ie.' It became very common in the early 1900s.
A 'kid' was originally a baby goat, but English speakers starting calling children 'kids' as playful slang—animals and children have been mixed up in language forever!
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