To express feelings or thoughts that have been troubling you; to confess or share something that's been weighing on your mind.
This phrase dates to the 16th century and draws from the physical sensation of emotional burdens - anxiety, guilt, and worry are literally felt as pressure or weight in the chest area. 'Getting it off' suggests physical relief from removing this emotional weight.
The phrase reflects remarkable body awareness - the chest really does feel heavy when we're emotionally burdened, as stress hormones affect our breathing and heart rate. Ancient cultures worldwide developed similar metaphors about removing weight from the heart or chest, suggesting this physical-emotional connection is universal to human experience.
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