Related Clues:

• Slowdown cause
• Bike part
• Good thing to do for animals
• Clutch neighbor
• Hinder progress
• Delay development
• React to the cop with the radar gun
• Pad site
• Heed a red light
• Reduce speed
• Stop on red, e.g.
• A driver often hits it
• Deceleratrix (a la Mr. Burns)
• Constraint
• Slow the growth of