Related Clues:

• Suppresses
• Abates
• Becomes less jammed, as traffic
• Diminishes
• Greases the wheels for, say
• Flows back, as the tide
• Dulls, as pain
• Relieves, as pain
• Moves slowly and carefully
• Flows out
• Eases off
• Mollifies
• Fades out
• Becomes less active
• Retrocedes