Related Clues:

• Descended
• Bird of peace
• Pacifist, sometimes
• Plunged
• Dropped to the bottom of the lake
• Cooing bird
• Dropped sharply
• Attacked, as a project, with "into"
• Went down like a cement block
• Peacemaker
• Lost seaworthiness
• Jackknifed, e.g.
• Made like the Titanic
• Columbiform bird
• What the Lusitania did