A small stone used in the children's game of hopscotch or similar games where stones are tossed and retrieved.
From 'chick' (a term for a small object or child's game) combined with 'stone.' The word emerged in British and American folk games, where various terms for game pieces developed regionally.
The word reveals how children's games preserve linguistic fossils—'chick' comes from Old English 'cicen' and was used playfully for anything small, much like how we say 'peanuts' for small amounts of money today.
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