If you describe someone as big-hearted, you think they are kind and generous, and always willing to help people.
An enlarged heart is a symptom brought on by various circulatory conditions rather than being a disease in and of itself. When it comes to emotions, having a larger heart might be advantageous, but when doctors refer to cardiomegaly—an enlarged heart—it typically means that something else is wrong with your heart.
Unhappily, as in He left her with a heavy heart, wondering whether she would ever get better. In a sad or wretched state. Since around 1300, the term heavy has been used to mean "weighed down by regret or misery." Light, its antonym, also originates from this time.
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