Related Clues:

• 'Really!'
• Emphatic affirmative
• 'Truly!'
• 'I swear!'
• 'You betcha!'
• 'Of course!'
• 'And that's ___' ('Believe you me')
• 'Really?'
• Start of an oath
• 'I'm telling the truth!'
• 'Of course'
• 'Without a doubt!'
• 'Absolutely!'
• Emphatic assent
• 'I'm not kidding!'