Related Clues:

• ''I'm off!''
• "Later, dude!"
• ''I'm history!''
• 'I'm out'
• Not as timely
• Kid's response to 20-, 37- and 55-Across
• Parting comment
• Delaying response
• Subsequent
• 'I'm out...'
• "See ya!"
• Less punctual
• 'Peace!'
• Afterwards
• ''Bye!''