Related Clues:

• Seal the deal, kid-style
• Solemn vow, between kids
• Digit-al agreement?
• Schoolyard handshake
• Kids' digital deal-sealer
• Schoolyard promise
• Use a two-digit confirmation code?
• Binding oath
• Make a promise, as kids do
• Playground promise
• Curse from the Brain’s not-so-brainy pal?
• Promise times infinity