Plural of chest, referring to either the upper front part of the human torso or storage containers/boxes.
From Old English 'cest,' from Latin 'cista' (box, basket). The anatomical meaning developed because the ribcage resembles a protective container for vital organs, creating a natural metaphorical connection.
The dual meaning of 'chest' as both body part and storage container reflects ancient understanding of anatomy - the chest literally is a bone box protecting treasures (heart and lungs). Pirate treasure chests and hope chests carry forward this ancient connection between containers and precious contents.
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