He could feel her body grow heavy in his arms.
For a moment he couldn't move - his feet seemed to grow heavy.
But if pain had weight, the air grew heavy with it.
After a few minutes' walking, though, the board started to grow heavy.
She had realized that his voice was growing heavy with sleep.
But before this could happen his head grew heavy and he fell once more into a deep sleep.
You grow heavy with child and it cannot be mine.
I failed to turn on the light when the sky grew dark and heavy.
Finally, however, her eyes grew heavy, and she closed them.
His legs grew heavy, it was an effort to take a step.