Her heart expanded with feelings almost too strong to contain.

Albert looked back at Bethany and felt his heart - apparently still whole - expand in his chest.

Her heart expanded to the bursting point with a rush of pent-up emotion.

Her heart and soul and mind expanded until they burst into a sparkling shower of light.

The heart cannot expand properly, so it does not fill with normal amounts of blood.

Rosetti felt his heart expand when he saw him.

New hopes are in their arms and legs, their hearts expand.

His heart expands to twice its normal size.

His heart expanded with a glimpse of hope.

When she looked up at him and smiled, he felt his heart expand until he thought it might explode.