Related Clues:

• Phrase in a kid's argument, perhaps
• "Cross my heart!"
• 'For real!'
• ''Amen''
• 'Yes, indeed!'
• ''I kid you not!''
• "Indeed!"
• "It's the truth!"
• ''It's true!''
• ''Truly!''
• 'Indubitably!'
• Answer to "It is not!"
• "Truly"
• ''That's a fact!''
• 'That's true!'