Related Clues:

• Descended gradually
• Sent to the ocean floor
• Fell to the bottom
• Deliberately sank a ship
• Pocketed, as a pool ball
• Registered, with "in"
• Put in the cup, as a golf ball
• Did well at Battleship
• "Sighted sub, ___ same"
• Succumbed to quicksand
• Hit the bottom
• (Of ship) went down
• Sent to bed, hurried along
• (Of ship) went under
• Holed, as a putt