What does "founder" mean?

Founder: (Naut.) To become filled with water, and sink, as a ship.

Additional senses

  1. 2.To fall; to stumble and go lame, as a horse. For which his horse fearé gan to turn, And leep aside, and foundrede as he leep. Chaucer.
  2. 3.To fail; to miscarry. "All his tricks founder." Shak.
  3. 4.To cause internal inflammation and soreness in the feet or limbs of (a horse), so as to disable or lame him.
  4. 5.(a) A lameness in the foot of a horse, occasioned by inflammation; closh. (b) An inflammatory fever of the body, or acute rheumatism; as, chest founder. See Chest ffounder. James White.

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