She came back to the table and sank down into her chair.

I sank down into my seat and looked out the window.

She sank down into the water and closed her eyes.

When he heard the door close, Daniel sank down into his chair again.

She sank down into one of the chairs, closed her eyes and began to talk.

He helped me turn and sink down into a sitting position.

Then a new scene would appear as he sank down into sleep again.

The fire sank down further into its bed of ash.

Almost at once the surface under him changed, and he began to sink down into the water.

Then he sank down into the water, until only his head was exposed.