The phrase "heart grew" is a correct and usable phrase in written English. You can use it to describe a feeling of emotional growth or expansion as a result of an experience or situation. For example, "Her heart grew after she volunteered at the local soup kitchen.".
That's how his heart grew three sizes that day.
In the year that followed, as his heart grew weaker, I kept at him to walk with me.
Dr. Hesham Sadek, a cardiologist at the medical center, and his colleagues worked with mice and found that if a portion of the heart was removed within the first week of life, the heart grew back completely.
Electrocardiography, the measurement of electrical activity in the heart, evolved from research by Dutch physiologist Willem Einthoven in 1903, and radiological evaluation of the heart grew out of German physicist Wilhelm Conrad Röntgen's experiments with X-rays in 1895.
"Absence makes the heart grow fonder"?
$23. SPANDEX makes the heart grow fonder.
Did absence make the heart grow fonder?
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