/ ˈsʌŋkən; NAmE / adjective
1.
[ only before noun ] that has fallen to the bottom of the sea or the ocean, or of a lake or river
SYN submerged :
a sunken ship
sunken treasure
2.
( of eyes or cheeks ) hollow and deep as a result of disease, getting old, or not having enough food
3.
[ only before noun ] at a lower level than the area around :
a sunken garden
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WORD ORIGIN
late Middle English : past participle of the verb sink .