n. 25B6; verb
the ship foundered : SINK, go to the bottom, go down, be lost at sea; informal go to Davy Jones's locker.
the scheme foundered : FAIL, be unsuccessful, not succeed, fall flat, fall through, collapse, backfire, meet with disaster, come to nothing/naught; informal flop, bomb.
their horses foundered in the river bed : STUMBLE, trip, trip up, lose one's balance, lose/miss one's footing, slip, stagger, lurch, totter, fall, tumble, topple, sprawl, collapse.
succeed.