Related Clues:

• Emulate a crab
• Spectral sound
• Mournful utterance
• Haunting sound
• Pained utterance
• Reaction to a bad joke
• Groan associate
• Ghostly utterance
• Sound of pain
• Murmur of discontent
• Grievous sound
• Complain, so to speak
• Sound of suffering
• Sound of pleasure, perhaps
• Climactic sound?