Related Clues:

• Literary detective's outburst
• Breathe hard as it's held by the doctor
• Express awe
• Relative of "My word!"
• "I say!"
• Startled sound
• 'Holy guacamole!'
• Old-fashioned oath
• Reaction to a shocking plot twist
• [Mercy!]
• Sound astounded
• Express disbelief
• Often-affected outburst
• Reaction to a revelation
• Awestruck response