Pocketed, as a pool ball

• What the Titanic did, famously
• Sent to the bottom
• "Sighted sub, ___ same": Mason
• Lost altitude
• Went down like a stone
• Dropped sharply
• Went bankrupt
• Holed, as a putt
• Lost seaworthiness

Wiktionary Word definitions in Wiktionary
vb. (en-simple past of: sink )