Your Chest and a Treasure Chest Are the Same Word

A chest is the front of the upper body, and a large box. The box came first, and the body part is named after it.

A chest is the upper front of the body, and also a large strong box. The box is the original: Old English *cest* meant a coffer, from Greek *kiste*, a basket. The body part borrowed the name around 1500 because the ribcage is a container, and English still treats it that way in phrases like *get it off your chest*. A chest of drawers is the box sense; a chest infection is the body sense.

Word forms

FormWordExample
NounchestA broad chest.
PluralchestsTwo chests.
AdjectivechestyA chesty cough.
CompoundchestnutUnrelated word.
GreekkisteA basket.

Body parts named after objects

Old English *cest*, a box or coffer, from Latin *cista*, from Greek *kiste*, a basket. The anatomical sense appeared around 1500.

Which meaning of chest came first?

The box. The anatomical sense borrowed the word around 1500, treating the ribcage as a container.

Is chestnut related to chest?

No. Chestnut comes from Greek kastanon, the name of the tree, and only resembles chest by accident.

Sources

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