To have let something fall or released it from your hand, usually unintentionally.
From Old Norse 'dropa' meaning a droplet or to fall in drops. The word originally just meant a small amount of liquid, but expanded to mean letting something fall completely.
The word 'drop' started as a Scandinavian word just for tiny bits of liquid—then English speakers used it to describe the sound and motion of things falling, and now it's a completely different meaning from its original 'tiny droplet' origin.
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