Related Clues:

• See 27-Down
• In --- (harmonious)
• Together, after 'in'
• Compatible (with ''in'')
• Word with lip or 'N
• Coordination
• Fit the sound to the action
• Lip-___ (mouth the words)
• Bring into harmony
• Make harmonious
• Pop group 'N ---
• Harmony, briefly
• In ___ (coordinated)
• Match up
• Lip-___ (not really sing)