A stone or rock thrown as a projectile, especially in games or as a child's toy.
Compound of 'chuck' (to throw) and 'stone' (rock), from Old English. Dating to at least the 16th century as a term for stones children would throw in play.
Before modern toys, a chuckstone was essentially a free plaything—archaeological evidence suggests humans have been throwing rocks for fun for millions of years, making this one of our oldest recreational items.
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