Related Clues:

• Word of assent
• Cry of delight
• 'Uh-huh'
• 'You bet!'
• Slangy approval
• 'I knew it!'
• It's positive
• Persevere
• Up, as a vote
• Tough
• 'Why not?'
• Go-ahead
• Continue
• Proceed
• 'Undoubtedly'