A past tense and the past participle of sink.(verb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sunk" in a sentence
"Even before his marriage, Lionel was made Earl of Ulster, a title sunk after 1362 in the novel dignity of the duchy of Clarence."
"The satisfied torpor in which they are sunk is the deadly inertia that precedes dissolution."
"Palin sunk John McCain's ship and she will do the same for the GOP."