Related Clues:

• Boom, e.g.
• Boom or box
• Practice pugilism
• Prepare for the ring
• Argue
• Translucent mineral
• Practice one's one-two
• Lock horns
• Mix it up
• Canvas support
• Box without a prize
• Jib boom or gaff
• Sailboat feature
• Box with headgear
• Go a few rounds