heartburn

the compound word 'heartburn' is a native english formation, combining two old english roots. its literal sense, a burning sensation in the chest near the heart, dates to the late 14th century. this physical description was later extended metaphorically in the 16th century to describe intense emotional states like resentment or jealousy, which were felt as a figurative 'burning' in the heart, the traditional seat of passion. the term exemplifies how anglo-saxon roots were combined to create a vivid descriptor for both a medical condition and an emotional experience.

Structure: heart + burn heart (old english, 'heorte', referring to the organ or the center of feeling) + burn (old english, 'bærnan', meaning to be on fire or to consume by fire)