Answer: sunk

AnswerCrossword Clue
SUNKSent to the ocean's floor
SUNKDone for: Slang.
SUNKImmersed.
SUNKDone for: Colloq.
SUNKMorose: Slang.
SUNKIn the dumps.
SUNKDone for, familiarly
SUNKDefeated
SUNKBankrupt, so to speak
SUNKBankrupt
SUNKAt the ocean's bottom, as a ship
SUNKShipwrecked
SUNKBankrupted
SUNKX'd out completely, in the game battleships
SUNK"You ... my battleship!"
SUNKAussie metal band ... Loto
SUNKDepressed.
SUNKGone to Davy Jones' locker
SUNKWent down
SUNKLike the Titanic
SUNKWent under
SUNKLike a ship on an ocean floor
SUNKLike many ships in the Bermuda Triangle
SUNKLike ships on the ocean floor
sunkto fail in health
sunkto decrease in amount or intensity
sunka turf seat
sunkto fall, drop, or descend to a lower level or state
sunkto dig, as a shaft
sunkbasin connected with a water supply and a drain
sunkto cause to sink
SUNKLike pocketed pool balls
SUNKGone under
SUNKDone for
SUNKAt the bottom, say
SUNKDoomed
SUNKGone to Davy Jones's locker
SUNKSubmerged
SUNKBeyond saving
SUNKLike costs that can't be recovered, in economists' lingo