Slumped

• Suffered the same fate as the Titanic
• Modest Mouse "We Were Dead Before the Ship Even ___"
• Dropped in the drink
• Dropped sharply
• Headed to bed?
• Visited Davy Jones' locker, in a way
• Went to the bottom of the ocean
• Settled gradually
• Behaved like a lead balloon?

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
past tense of sink (q.v.).