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To sink below the surface of the water: The ship struck a reef and foundered.
(verb-intransitive)
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To cave in; sink: The platform swayed and then foundered.
(verb-intransitive)
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To fail utterly; collapse: a marriage that soon foundered.
(verb-intransitive)
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To stumble, especially to stumble and go lame. Used of horses.
(verb-intransitive)
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To become ill from overeating. Used of livestock.
(verb-intransitive)
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.