Related Clues:

• Sound of a fine-tuned engine
• 'I'm happy' in Siamese?
• Backrub response
• Sound of satisfaction
• On edge
• Physical sound?
• ''I'm happy'' in the Siamese?
• 'What a relief!'
• Catty comment
• 'Don't stop'
• Sigh of relief
• 'Won-der-ful!'
• Cat ''aah!''
• ''That's it!''
• Sound of relief