Related Clues:
- Out of ___ (not working well together)
- Move lips to music (Abbr.)
- Working well together, after 'in'
- Harmonization, briefly
- In ___ (on the same page)
- Lip-__: mouth the words
- Something to sing in
- Bi-bicycle?
- Perfect agreement
- Two-person bike
- Lip-___ (pretend to sing)
- In ___ (working in harmony)
- Full agreement
- Complete harmony
- A trio may sing in it