Releasing or letting something go free, or firing an arrow or projectile.
From Old Norse 'lauss' meaning 'loose' or 'free,' related to German 'los.' It evolved to mean 'to set free' and in archery specifically 'to release an arrow'.
Medieval archers 'loosed' arrows thousands of times at war—the word is still used in archery today, meaning the simple act of releasing the bowstring is so important it got its own special word.
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