Related Clues:

• Sound of a fine-tuned engine
• 'I'm happy' in Siamese?
• Siamese 'please'
• Sound of satisfaction
• ''I'm happy'' in the Siamese?
• Catty comment
• Copy cats
• Cat ''aah!''
• Sound of contentment
• Show pleasure
• Kittenish comment
• Sound like a well-tuned engine
• Feline line
• ''I'm happy'' in Siamese?
• Run smoothly