An informal or playful word for a child or young person.
From 'kid' (originally a young goat, from Old Norse 'kið') + '-y' (diminutive suffix). The word first meant a young goat, then transferred to mean a young person, with '-y' making it affectionate.
We call children 'kids' because the word originally meant young goats, then English-speakers apparently thought 'kid' was cute enough to steal for baby humans—and it stuck after 400 years!
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