Related Clues:

• Intensify
• Volunteer
• Increase
• Accelerate
• Increase, as the pace
• Come forward
• Answer the call
• Escalate
• Increase in intensity
• Increase, as production
• Make your presence known
• Promotion
• Increase - or ascend
• Increase as with pace - or ascend stair?
• Come upstairs for the pets?