Related Clues:

• Adds one to three, e.g.
• Some roulette bets
• Roulette bets
• Odds alternative
• Smooths
• Lines up
• Straightens
• The odds are against them
• 12/24 and 12/31
• Stabilizes
• One group of numbers to pick
• Levels (out)
• Smooths (out)
• 50-50
• They're at odds with odds