Related Clues:

• Wanes
• Loosens up
• Allays
• Lightens up
• Reposes
• Alleviates
• Simplifies
• Abates
• Becomes less jammed, as traffic
• Greases the wheels for, say
• Dulls, as pain
• Relieves, as pain
• Moves slowly and carefully
• Mollifies
• Soothes