Certain genes cause the heart to grow more than it should.

The doctors discovered his heart had suddenly grown large and weak.

He smiled, because his heart had grown light at last.

His heart grew heavier with every echoing step he took.

Her heart grew cold with fear; she knew something serious had happened.

Then one day they are sitting at home and her heart suddenly grows light.

For now that the end was at hand his heart grew light within him.

I asked, for my heart grew cold at the thought.

The walking was harder now, and the boy's heart grew small within him.

But even as he stood, there came a sound which made his heart grow cold.