a simple past tense and past participle of sink.
Informal. beyond help; done for; washed up: If they catch you cheating, you're really sunk.
Nautical. (of a forecastle or poop) raised less than a full deck above the weather deck of a ship.

1925–30 for def 2

half-sunk, adjective
unsunk, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sunk (sʌŋk)
1.  a past participle of sink
2.  informal with all hopes dashed; ruined: if the police come while we're opening the safe, we'll be sunk

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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.

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