Related Clues:

• Bound
• Spring
• See 10-Across
• Start
• A.A.A. offering
• Head start
• See 38-Across
• Parachute ___
• Stalled driver's request
• Sudden increase
• Skydive
• Basie's "One O'clock ___"
• Use a pogo stick
• Get startled
• Go for a rebound