Related Clues:

• Box without a ref
• "Live long and __": "Star Trek" blessing
• Have a debate
• Trade barbs
• Go toe-to-toe
• Airplane wing supporter
• Mast, yard, boom, or gaff
• Fight, but not all-out
• Pole used in rigging
• Practice on canvas
• Practice one's punches
• Box for fun
• Box gently
• Practice for the main event
• Train in a ring