Related Clues:

• 'Who's there?' reply
• 'Come in!'
• Not quite grammatical answer to 'Who's there?'
• Reply to a knock
• 'Who's there?' response
• Reply to 'Who's there?'
• Words to elicit recognition
• Knocker's announcement
• Words after 'Pssst!'
• Knocker's reply
• Answer to 'Who's there?'
• Response to 'Who's there?'
• 'C'est moi' to us
• 'Don't you recognize the voice?!'
• Response to a knock, perhaps