–verb (used without object)
(of a ship, boat, etc.) to fill with water and sink.
to fall or sink down, as buildings, ground, etc.: Built on a former lake bed, the building has foundered nearly ten feet.
to become wrecked; fail utterly: The project foundered because public support was lacking.
–verb (used with object)
to cause to fill with water and sink: Rough seas had foundered the ship in mid-ocean.
Veterinary Pathology . to cause (a horse) to break down, go lame, or suffer from laminitis.