His knees sank into the sand, taking most of his weight.

The man's knee sunk into the wet spring soil.

I slipped off with a sigh, and my hands and knees sank into the sandy bottom.

The knees should not sink too low, as this increases the drag.

His knees sank deeply into the thick Oriental rug before the altar.

His knees and elbows sank in, making movement impossible.

The boy's knees barely sank; he was strong for his age.

His knee sank into the cushions as he lay her down and followed with his own body.

He felt his knees weaken and sank onto the ice.

He stood slowly, his knees wobbling as his feet sank into the refuse.