get something off your chest

chest | American Dictionary

chest
noun[ C ]
us/tʃest/

chestnoun[C] (BODY PART)

the upper front part of the body of humans and some animals, between the stomach and the neck, enclosing the heart and lungs:
He folded his arms across his chest.

chestnoun[C] (BOX)

a large, strong box, usually made of wood, which is used for storing valuable goods or possessions or for moving possessions from one place to another

Examples of chest

chest
The keys to company chests were also kept by the ruling clique.
The keys of other chests were put in the safe-keeping of parish notables.
Attention is given thus to the regulation of meetings, chests and keys, and the selective discharge of information.
Their shoulders are round and very falling, their chests and hips narrow, their hands and feet very small, their stature from four feet eight inches to five feet one inch.
Although government complaints about the failure of chests to use their income philanthropically may have been accurate in the 1560s, the crisis of the 1570s instigated higher levels of expenditure.
The lure of possible housing profit brought funds out from chests or under mattresses, mobilizing the small funds of widows and the elderly besides those of larger lenders and syndicators.
The rate of import is now 20 chests per month, and it is not at present proposed to vary this amount.
From the
Hansard archive