Related Clues:

• Word in an Alka-Seltzer ad
• Dull sound
• Sit (down)
• Kerplunk
• Make a splash
• Sitting sound
• Fall sound
• Fall down
• Tumultuous sit-down
• When repeated, start of an old antacid jingle
• Fall heavily
• Falling-into-water sound
• Drop heavily
• Fall into a chair
• Settle down heavily