sunken

(heading, physical) To move or be moved into something.

(heading, social) To diminish or be diminished.

To conceal and appropriate.

To keep out of sight; to suppress; to ignore.

To pay absolutely.

“I have sunk thousands of pounds into this project.”

To reduce or extinguish by payment.

“to sink the national debt”

To be overwhelmed or depressed; to fail in strength.

To decrease in volume, as a river; to subside; to become diminished in volume or in apparent height.

Caused, by natural or unnatural means, to be depressed (lower than the surrounding area) or submerged

“The sunken ship lay at a depth of 100 feet”

(of eyes or cheeks) Seeming to have fallen deeper back into the face due to tiredness, illness, or old age.

“She looked old and thin with sunken cheeks and hollow eyes.”