half sunken


having sunk or been sunk beneath the surface; submerged.
having settled to a lower level, as walls.
situated or lying on a lower level: a sunken living room.
hollow; depressed: sunken cheeks.
Obsolete. a past participle of sink.

1325–75; Middle English, past participle of sinken to sink

half-sunken, adjective
unsunken, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sunken (ˈsʌŋkən)
1.  a past participle of sink
2.  unhealthily hollow: sunken cheeks
3.  situated at a lower level than the surrounding or usual one
4.  situated under water; submerged
5.  depressed; low: sunken spirits

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. sincan "become submerged, go under" (past tense sanc, pp. suncen), from P.Gmc. *senkwanan (cf. O.S. sinkan, O.N. sökkva, M.Du. sinken, Du. zinken, O.H.G. sinkan, Ger. sinken, Goth. sigqan), from PIE base *sengw- "to sink." The transitive use supplants M.E. sench (cf. drink/drench) which died
out 14c. Sinking fund is from 1724; sinker in fishing line sense is from 1844. Adjective phrase sink or swim is from 1668. To sink without a trace is WWI military jargon, transl. Ger. spurlos versenkt.

1413, "pool or pit for wastewater or sewage," from sink (v.). Sense of "shallow basin with drainpipe" first recorded 1566.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sink   (sĭngk)  Pronunciation Key 
  1. A part of the physical environment, or more generally any physical system, that absorbs some form of matter or energy. For example, a forest acts as a sink for carbon dioxide because it absorbs more of the gas in photosynthesis than it releases in respiration. Coral reefs are a long-lasting sink for carbon, which they sequester in their skeletons in the form of calcium carbonate.

  2. Geology

    1. See playa.

    2. See sinkhole.

    3. A circular depression on the flank of a volcano, caused by the collapse of a volcanic wall.

The American Heritage® Science Dictionary
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