Related Clues:

• “So long!”
• Greeting government agency circular
• “Later, gator!”
• Activator, oddly inactive for so long
• 'Sayonara,' in Siena
• Hi! — Bye!
• Vowel-rich farewell
• Vatican farewell
• "Bye," in Abruzzi
• ''Night'
• “Toodle-oo!”
• Turin "Ta-ta!"
• ''Buh-bye''
• Way of saying goodbye
• European aloha cousin